What this guide covers: the first-generation Subaru BRZ ZC6 with the FA20 2.0L naturally aspirated boxer-4, sold in North America from 2013-2020. It also overlaps with the Scion FR-S and Toyota 86/GT86, but this page is written for BRZ owners deciding what to buy, when to tune, what to log, and what to avoid.
Platform Snapshot (vehicle-specific)
- Vehicle: Subaru BRZ, first generation ZC6
- Platform siblings: Scion FR-S, Toyota 86 / GT86
- Engine/fuel system: FA20 2.0L naturally aspirated boxer-4 with direct and port injection
- Factory baseline: 2013-2016 BRZ is rated at 200 hp / 151 lb-ft
- Drivetrain: rear-wheel drive with Torsen limited-slip differential
- Transmission: 6-speed manual or 6-speed automatic
- Common complaint: midrange torque dip, usually addressed with header plus tune
- Real power path: header, fuel, and calibration before intake or catback
Model-year notes
- 2013-2016 BRZ: 200 hp / 151 lb-ft factory rating.
- 2017-2020 manual BRZ: 205 hp / 156 lb-ft, revised engine components, 4.3 final drive, and Track mode naming.
- 2017+ automatic BRZ: did not get the same manual-output bump; verify the exact spec by VIN and market.
- 2017+ Performance Package / Series.Yellow: Brembo brakes, SACHS dampers, and 17x7.5 wheels are useful starting hardware, but hard driving still needs pads, fluid, tires, and alignment.
2013 recall check: For 2013 cars, verify valve-spring recall / WTY-84 status by VIN and service history before spending tuning money. If the recall was performed, note who did it and whether there are oil leaks, sealant issues, noises, or post-service records. This does not make every 2013 bad; it means the service history matters.
Quick start (fastest daily-real improvement)
- Tires + alignment: front camber and good rubber change the car immediately.
- Brake fluid + pads: do this before track time, mountain driving, or repeated hard stops.
- Header + tune: the main naturally aspirated path for midrange and torque-dip cleanup.
- Oil temperature control: move this up for HPDE, hot climates, or long high-rpm sessions.
The first-gen BRZ is a momentum car. A good ZC6 feels sharp because the basics are sorted: tires, alignment, brakes, oil temperature, and a calibration that matches the hardware and fuel.
Glossary (quick defs)
- ZC6: Subaru chassis code for the first-generation BRZ.
- FA20: 2.0L naturally aspirated boxer-4 used in BRZ/FR-S/86.
- Torque dip: midrange flat spot many owners address with header and tune.
- OFT: OpenFlash Tablet, a common flash-at-home device for first-gen 86/BRZ.
- EcuTek: pro-tuner ecosystem for custom tuning, flex fuel, and forced induction.
- UEL / EL header: unequal-length or equal-length header design; changes sound and power curve.
- IAM / DAM / advance multiplier: tuner/logger vocabulary for ignition advance confidence.
Before you tune
- Confirm maintenance first: oil, coolant, plugs, coils, air filter, brake fluid, tires, alignment, battery health, and no active misfire/CEL issues.
- Know the exact model year, transmission, market, ECU/ROM support, fuel octane, emissions rules, and installed hardware before buying a tune.
- Do not tune around a mechanical problem. A tune should make a healthy car fit its hardware and fuel, not hide bad plugs, vacuum leaks, MAF issues, old fuel, or heat problems.
- Baseline the car first: note tire setup, alignment, oil temps, brake feel, and any knock/timing behavior before adding parts.
- Save the factory tune and keep part numbers/receipts in the Garage/mod log.
Which tuning path should you choose?
| Setup | Good path | Avoid | What to validate |
|---|---|---|---|
| Stock / daily | Stay stock ECU or use OFT only if you understand map and fuel requirements. | Random intake with no MAF scaling. | No CEL, stable trims, clean fuel, no knock correction pattern. |
| Header + stock airbox | OFT or EcuTek with a map matched to header type and fuel. | Running a header without a calibration. | AFR/lambda, fuel trims, IAM/DAM/advance multiplier, knock correction, oil temp. |
| E85 / ethanol | Dedicated E85 map or proper flex-fuel hardware and calibration. | Guessing ethanol content on a normal pump-gas map. | Ethanol content, trims, lambda, timing/knock behavior. |
| Forced induction | Custom EcuTek/pro tune with fuel, clutch, cooling, and brake planning. | Treating boost like a bolt-on. | Fuel pressure, boost, lambda, knock, oil temp, plugs, compression/leakdown if needed. |
Stage names vary by tuner. Do not assume “Stage 1” or “Stage 2” means the same hardware, fuel, or risk level everywhere.
3 Build Paths
1) Daily / OEM+ fun
- Tires + alignment with useful front camber.
- Brake fluid if the car is old or driven hard.
- Catback for sound only; choose drone control over volume.
- Stock ECU or light tune only after maintenance is current.
2) Street performance
- Header + tune to clean up the midrange and response.
- Front camber hardware before cosmetic suspension.
- Street/track pads when the stock pads fade.
- Flex fuel only with sensor hardware and a calibration built for it.
3) Track / boosted-prep
- Oil cooler before long high-rpm sessions.
- Track pads, high-temp fluid, and ducts if fade appears.
- Dampers/coilovers after alignment and tire data.
- Fuel, ignition, clutch, and brake plan before forced induction.
Highest Performance-per-Dollar (Ranked Table)
This ranking assumes a healthy stock or lightly modified BRZ. If the car is already a 2017+ Performance Package model, factory Brembo/SACHS hardware may move brake hardware lower, but pads/fluid still matter.
| Rank | Mod category | Buy it when | Skip it when | Validation |
|---|---|---|---|---|
| 1 | Baseline maintenance + inspection | The car is new to you, high-mileage, or has unknown records. | Never skip it. | No CEL/misfire, fresh fluids, healthy plugs/coils, no leaks, good battery. |
| 2 | Tires + alignment | You want more grip, steering feel, or tire life. | Current tires are already fresh and aligned for your use. | Tire temps/wear, pressure notes, steering feel, front shoulder wear. |
| 3 | Header + ECU tune | You want measurable NA output and better midrange. | You only want sound. | Lambda, trims, IAM/DAM, knock correction, oil temp. |
| 4 | Brake pads + fluid | Pedal gets long, fluid is old, or pads fade. | Daily street car with no fade. | Pedal feel, pad wear, rotor condition, fluid age. |
| 5 | Oil cooling | HPDE, hot weather, or repeated high-rpm use raises oil temps. | Normal commuting with stable oil temps. | Oil temp trend, leaks, warmup behavior, fittings after install. |
| 6 | Suspension matched to use | Tire wear, balance, or damper control gives you a real problem to solve. | You just want the car lower. | Alignment sheet, tire wear, ride height, damper settings, lap/autocross notes. |
Best picks (Subaru BRZ FA20)
- Tires: max-performance summer tire for street use, or 200tw if autocross/track is real. Pick size around alignment and wheel fitment, not just width.
- Alignment: front camber hardware before cosmetic suspension.
- Brakes: pads + high-temp fluid before calipers.
- Power: header + tune before intake/catback if you want measurable NA output.
- ECU: OFT for common stock-airbox/header map setups; EcuTek for custom header/intake/flex/forced induction.
- Cooling: oil cooler for HPDE, hot climate, or repeated high-rpm use.
Intake / Airflow
The FA20 intake path is not the first power bottleneck for most naturally aspirated builds. Many intakes mainly add sound, and some create MAF scaling problems if the tune does not account for them.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| Stock airbox + panel filter | You want stable metering and easy service. | You expect a big power gain. | No, with stock-sized filter. | Fuel trims, idle, no intake leaks. | Minimal power change. | |
| Sealed intake | You want sound/serviceability and your tuner supports the intake. | You are chasing power-per-dollar. | Often yes if MAF housing/path changes. | MAF scaling, trims, idle, part-throttle behavior. | Heat, noise, drivability, emissions concerns. | |
| Tune-supported intake | Your EcuTek tuner asks for a known intake package. | You do not have tuner support for that exact part. | Yes. | Logs before and after, MAF voltage/airflow, trims. | Cost and support vary by ROM/year. |
Exhaust
For first-gen BRZ power, the exhaust decision starts at the header. A catback changes sound and weight. It does not fix the torque dip by itself.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| Header | You want measurable NA output and better midrange. | You only want sound. | Yes. | Lambda, trims, knock correction, oil temp. | Emissions, heat, noise, install quality, inspection risk. | |
| Catted street-conscious header | You want the header path with less smell and inspection risk than catless. | Your local rules or inspection make any header change a bad idea. | Yes. | Same as header, plus exhaust-leak check. | Still has emissions and inspection risk. | Headers + exhaust legality guide |
| Catback / axle-back | You want sound or lower weight. | You expect a torque-dip fix. | No, if after the header and sensors. | Drone check, cold-start volume, cabin comfort. | Rasp, drone, attention, neighborhood tolerance. | |
| Front pipe / overpipe | You are completing a known exhaust setup after the header decision. | You are trying to avoid noise or inspection risk. | Sometimes, depending on sensor/cat changes. | Exhaust leaks, trims, sound under load. | More noise, smell, heat, and inspection exposure. |
Equal-length headers tend to keep a smoother boxer tone and can favor high-rpm flow. Unequal-length headers add the classic uneven boxer sound and can shift the curve differently. Pick by tune support, legality, sound tolerance, and use case.
Tuning Options (ECU)
OFT makes sense for common FA20 combinations where the map requirements match your car. EcuTek makes sense when the setup needs custom work, log review, flex fuel, forced induction, or a tuner who can revise the calibration.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| OpenFlash Tablet | You run a stock airbox and a common supported header/fuel setup. | Your hardware does not match the OTS file requirements. | It is the tuning tool. | Calibration ID, fuel octane, trims, IAM/DAM, knock correction. | Less custom depth than a pro-tuned workflow. | |
| EcuTek pro tune | You need custom header/intake/flex/forced-induction calibration. | A basic OFT-supported setup covers your exact hardware and goals. | It is the tuning workflow. | Tuner log review, lambda, trims, knock, oil temp. | More cost and tuner dependency. | |
| Dedicated E85 map | You will run known E85 and can test ethanol content. | Fuel content varies and you will not test it. | Yes. | Ethanol content, trims, lambda, knock correction. | Cold start, fuel availability, content variation. | |
| True flex-fuel setup | You want the tune to adjust for ethanol content. | You are not installing sensor hardware or getting a proper calibration. | Yes. | Sensor reading, fuel trims, lambda, timing, knock behavior. | Hardware cost and tuner support. |
Required reading:
What to log after tuning
- Oil temperature
- Coolant temperature
- AFR/lambda
- Short-term and long-term fuel trims
- IAM/DAM/advance multiplier, if available through the tool
- Knock correction / learned knock / feedback knock, depending on logger vocabulary
- MAF voltage or airflow
- Ignition timing
- Throttle command vs actual behavior
- Misfire behavior
- Same-gear pulls under repeatable conditions
- Notes on fuel brand/octane/ethanol content
Do not call the tune safe after one clean pull. Repeat conditions, keep fuel notes, and send the tuner the boring details.
Cooling / Reliability
The FA20 is happiest with clean oil, controlled oil temperature, correct plugs, and a calibration that does not chase timing on bad fuel. Street cars can stay simple. Track cars need heat planning.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| Oil cooler | HPDE, hot climate, or repeated high-rpm use pushes oil temps up. | Normal street use has stable oil temps. | No. | Oil temp trend, warmup time, leaks/fittings after install. | More lines/fittings; thermostat choice matters. | |
| Spark plugs / ignition service | Misfire, roughness, tuned/high-load use, or unknown service history. | Plugs are fresh, correct, and logs are clean. | No, but tune may specify plug choice/gap. | Misfire counts/feel, knock noise, plug condition. | Labor and part-number accuracy matter. | |
| Brake fluid | Pedal gets long, fluid is old, or track use is planned. | Fresh high-temp fluid is already in the car and not boiling. | No. | Pedal feel, bleed interval, fluid age. | More frequent service if tracked. | |
| Radiator / coolant support | Coolant climbs during long sessions. | Oil/brake heat is the actual problem. | No. | Coolant temp trend, fan operation, cap/hoses. | Often secondary on NA cars. |
Tires
Wider is not automatically better. A sensible tire with front camber and correct pressure is more useful than a wide setup that rubs, steers poorly, or never reaches temperature.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| Max-performance summer tire | You want daily grip, steering feel, and wet behavior. | Cold-weather or long-life commuting is the main job. | No. | Pressure notes, wet grip, shoulder wear. | Shorter life than touring tires. | |
| 200tw autocross/track tire | Autocross or HPDE is real, not imagined. | The car is mostly cold/wet street use. | No. | Tire temps, pressure rise, wear pattern. | Noise, wear, wet/cold compromise. | |
| Fitment planning | You are changing wheels, width, offset, camber, or ride height. | Stock wheels and tires already suit the use. | No. | Rub check, alignment sheet, steering feel. | Aggressive fitments can hurt response. |
Brakes + Handling
Brakes
Stock brakes are workable because the BRZ is light. Pads and fluid are the first move. The 2017+ Performance Package gives you Brembo hardware, but it still needs the right compound and fluid for hard use.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| Pads + high-temp fluid | Pedal gets long, fluid is old, pads fade, or track sessions expose heat. | Daily street car with no fade. | No. | Pedal feel, pad wear, rotor temps/condition, fluid age. | Dust, noise, rotor wear, maintenance. | |
| Brake ducts | Pads/rotors overheat before the session ends. | One or two hard street stops are the only use. | No. | Pad taper, rotor condition, session fade notes. | Install complexity and street damage risk. | |
| Big brake kit | Repeated high-speed braking exceeds pads/fluid/ducts. | You have not tried pads/fluid yet. | No. | Rotor temps, pad wear, pedal consistency, wheel clearance. | Cost, wheel clearance, pad availability. |
Suspension: alignment, sway bars, dampers
Start with alignment. Front camber improves turn-in and tire wear. Sway bars tune balance. Dampers control motion. Coilovers are worthwhile when you need setup range, not just a lower ride height.
| Category / part | Buy it when | Skip it when | Tuning required? | Validation | Tradeoffs | Link |
|---|---|---|---|---|---|---|
| Camber bolts / plates | You need front grip and tire shoulder life. | You will not get a real alignment afterward. | No. | Alignment sheet, tire wear, steering feel. | Too much toe ruins tires. | |
| Springs / sway bars | You have a specific balance or body-control goal. | You only want the car lower for looks. | No. | Ride height, bump travel, tire wear, balance notes. | Ride, bump travel, NVH. | |
| Coilovers / dampers | You need damper control and repeatable setup for tires/use. | The stock dampers are healthy and the car has no setup problem. | No. | Alignment, corner balance if needed, tire wear, lap/autocross notes. | Setup time, maintenance, ride quality. |
Recommended Mod Order (Step-by-step)
- Baseline maintenance: oil, coolant, brake fluid, plugs, coils, filters, tires, alignment, bushings, wheel bearings, and damper condition.
- Tires plus performance alignment.
- Pads and high-temp brake fluid if you drive hard.
- Header plus ECU tune if you want the car to pull cleaner through the midrange.
- Oil cooler for track or repeated high-rpm use.
- Catback/front pipe only if sound and legality match your goals.
- E85/flex fuel only with sensor hardware or a dedicated map, fuel testing, tune support, and logs.
- Suspension tuning: camber, sway bars/end links, springs, then coilovers/dampers.
- Forced induction only after fuel, cooling, ignition, clutch/transmission, and brake plans are honest.
Forced induction note
Boost changes the FA20 budget. Before buying a kit, read boost vs timing, intake vs intercooler, and the intercooler guide. A boosted BRZ needs fuel, clutch, brake, cooling, and logging plans, not just a compressor and a dyno appointment.
FAQ
What is the best first mod for a first-gen Subaru BRZ?
For most owners, tires plus alignment. If the car is old or driven hard, brake fluid and pads come before power parts.
Is tuning worth it on a stock FA20?
It can improve response and drivability, but naturally aspirated gains are modest. Header plus tune is the main FA20 power path.
Should I tune before installing headers?
No. Install the header and tune as a matched plan. Running a header without the correct calibration can create drivability, fueling, and knock issues.
What fixes the FA20 torque dip?
A header and calibration matched to the header, fuel, and ECU ROM. Catback exhaust alone does not fix the midrange flat spot.
Should I use OpenFlash Tablet or EcuTek?
OFT fits common stock-airbox/header map setups. EcuTek is the better route for custom header, intake, flex-fuel, forced-induction, or deeper log review.
Can the FA20 run ethanol?
Yes, but use a dedicated E85 map or a proper flex-fuel setup with sensor hardware and calibration. Do not guess ethanol content on a pump-gas map.
Is a 2013 BRZ a bad tuning candidate?
Not automatically. Check valve-spring recall status, maintenance records, compression/leakdown if concerned, and overall condition before modifying.
What should I log after tuning?
Oil temperature, coolant temperature, lambda/AFR, fuel trims, IAM/DAM or advance multiplier if available, knock correction, MAF behavior, ignition timing, misfires, and fuel details.
Related guides
- Model hub: Subaru BRZ
- Second-gen guide: Subaru BRZ FA24 performance guide
- Platform sibling: Toyota 86 / GT86 / Scion FR-S FA20 performance guide
- Alignment for street and track
- Brakes for performance driving
- What to log on a tuned car
- Knock correction explained
- Headers + exhaust: power vs noise vs legality
- Spark plugs, gap, and heat range
- Feature page: Digital Garage