Toyota GR Supra A90 tuning: Stage 1 to Stage 4 explained

Power by stage

Stage 1 and 2 are estimates: bootmod3's published percentage gains applied to the 382 hp US stock figure. Stage 3 and 4 are typical build ranges. Real results depend on fuel, weather and the individual car.

Stock382 hp

Stage 1≈466–489 hp Stage 2≈481–512 hp Stage 3600–700+ hp Stage 4800+ hp

Software only

up to +28%

Stage 1 is a flash of the factory engine computer through the OBD port. Toyota revised the B58 for 2021+ with a new exhaust manifold, lower-compression pistons and 382 hp, so check your model year: 2020 cars start from the earlier 335 hp version.

Stage 1 tuning platforms compared

Platform	Fuel	Claimed gain	≈ Power (2021+)	Notes
bootmod3	91 US	up to +22%	≈466 hp	Cloud-based flash tool with map switching on the steering wheel
bootmod3	93 US	up to +25%	≈478 hp	Same file family on higher-octane fuel
bootmod3	E30 blend	up to +28%	≈489 hp	Needs a roughly 30% ethanol blend
MHD	Multiple	See brand page		The other popular flash tool for Stage 1 and 2
JB4	Multiple	See brand page		Piggyback box, easy to remove, but a lower ceiling

Recommended with Stage 1

Heat exchanger (intercooler) upgrade strongly recommended CSF Wagner Tuning Mishimoto
The A90 cools its charge air through a water-to-air system. A bigger heat exchanger keeps power consistent in hot weather and on repeated pulls.
Gearbox (TCU) tune recommended xHP
A gearbox tune for the ZF 8-speed sharpens shifts and raises the torque it will accept.

Before you buyCars built after about June 2020 may have a locked engine computer that has to be bench-unlocked before bootmod3 or MHD can flash it. Ask the shop to check your car first.

Downpipe and breathing parts

up to +34%

Stage 2 adds a downpipe, the biggest single hardware gain on the B58, and runs a file written for it. An intake, a bigger intercooler and a cat-back exhaust complete the package.

Stage 2 tuning platforms compared

Platform	Fuel	Claimed gain	≈ Power (2021+)	Required hardware
bootmod3	91 US	up to +26%	≈481 hp	Downpipe
bootmod3	93 US	up to +28%	≈489 hp	Downpipe
bootmod3	E30 blend	up to +34%	≈512 hp	Downpipe
MHD	Multiple	See brand page		Downpipe

Parts list

Downpipe required VRSF AWE Tuning Active Autowerke Akrapovič
Typically worth 20–30 hp with the right tune, and it helps the turbo spool faster. Choose a catalysed version to stay road legal.
Intercooler upgrade recommended CSF Wagner Tuning Mishimoto
Keeps intake temperatures stable under heavy load.
Intake recommended Eventuri AWE Tuning Dinan
Small power gain, sharper throttle response and more turbo sound.
Cat-back exhaust optional Akrapovič AWE Tuning VRSF
Mostly sound. Not required for Stage 2 power.

Before you buyCatless downpipes break emissions laws in most countries and fail inspection. Keep the original parts if you might sell the car.

Bigger turbo, fuel and gearbox

600–700+ hp

Past Stage 2 the stock turbo runs out. A hybrid or big turbo adds 100–300 hp, and builds this size usually move to EcuTek for flex-fuel and port-injection control. Full E85 is not possible on the stock fuel system, and the stock ZF gearbox starts to slip at around 650 wheel horsepower.

Parts list

Hybrid or big turbo required Pure Turbos HKS
Hybrids keep the factory fitment; big-turbo kits need a new manifold and supporting parts.
Low-pressure fuel pump and port injection required Spool Performance Fuel-It
The stock fuel system manages roughly E40–E50 with a flex-fuel sensor. Full E85 needs an upgraded low-pressure pump and port injection.
Custom tune on EcuTek required EcuTek
The usual platform for big-turbo, flex-fuel and port-injection builds.
Built gearbox required Spool Performance Pure Turbos
Built ZF 8-speed gearboxes are rated from about 700 to over 1,000 wheel horsepower. Plan it together with the turbo.

Before you buyBudget for the gearbox from the start. Most big-turbo Supras that stop at the side of the road have a slipping transmission, not a broken engine.

Built engine

800+ hp

The B58's factory bottom end is strong, so a built engine is for serious drag and roll-race builds. The quickest A90s in the world run heavily modified B58s at well over 1,000 hp. These are community build ranges, not product claims.

Parts list

Forged pistons and steel connecting rods required JE Pistons Wiseco
Sold as matched sets for the B58. Choose the compression ratio with your tuner.
Custom dyno tune required EcuTek
Every Stage 4 car is tuned on its own.
Driveline, cooling and brakes required Spool Performance CSF
Gearbox, differential, axles, cooling and brakes all have to keep up with the engine.

Before you buyStage 4 is an engine build, not a bolt-on. Choose one shop to build, tune and stand behind the whole package.

Questions to ask the shop

Is my car a 2020 or a 2021+ model, and does its engine computer need unlocking?
Which platform will you use, bootmod3, MHD or EcuTek, and why?
Which exact file will you flash, and for which fuel?
Is the downpipe catalysed and road legal where I live?
Does my gearbox need a tune or a rebuild at this power?
Can the tune be returned to stock, and what does that cost?