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Toyota GR YarisStage 1 to Stage 4 tuning guide

The GR Yaris has the G16E-GTS, a 1.6-litre turbo three-cylinder, with GR-Four all-wheel drive. European cars made 261 PS and 360 Nm until 2024, and the updated car has 280 PS and 390 Nm and an optional 8-speed automatic (the Toyota press pack). The GR Corolla uses the same engine with 300 hp in the US (The Drive), so tunes and most engine parts are shared. Tuning goes through EcuTek tuners or a plug-in Syvecs computer, and the limits are heat, the clutch and the factory turbo.

Years: 2020– (updated 2024)
Engine: 1.6 G16E-GTS turbo three-cylinder
Gearbox: 6-speed manual; 8-speed GR-DAT auto from 2024
Stock power (EU): 261 PS / 360 Nm; 2024 on 280 PS / 390 Nm

Power by stage

Stock is Toyota's figure for European cars. Stage 1 to 4 are tuners' own claims, mostly UK figures on 99 octane; Garage Whifbitz measures at the wheels and converts to engine power, so its figures are estimates. Israel sells 98 octane at most, so expect a little less.

Stock261–280 PS

Stage 1300–310 hp Stage 2320–350 hp Stage 3360–435 hp Stage 4415–470 hp

Names with an arrow go straight to that part's product page for this car. Names in a dashed outline are other brands that make the part; exact links for them are being added.

1

Stage 1: Software only

300–310 hp

A remap on a standard car claims about 300–310 hp, from Toyota's 261 PS. UK tuners write their own files with EcuTek, and Garage Whifbitz says a totally standard car normally makes around 300 bhp with a remap (its guide). Toyota itself now sells GR Performance Software in Japan, which adds torque and changes the four-wheel-drive and steering settings (Toyota Japan). Plug-in modules add less and change nothing permanently.

Typical cost: Forge remap £400, done at Forge; Toyota's GR Performance Software ¥99,000–¥265,100 in Japan.List prices, Sept 2026, before shipping, import tax and fitting.

Stage 1 tunes compared

Tune	Fuel	Claimed power	Claimed torque	Notes
Forge Motorsport Stage 1	—	310+ bhp	405 Nm	From Toyota's 257 bhp / 360 Nm; done at Forge in Gloucester, about two hours
VUDU Performance Stage 1	99 RON recommended	310 bhp	306 lb-ft	VUDU quotes 260 bhp / 266 lb-ft stock
Garage Whifbitz EcuTek remap	99 RON	about 300 bhp	—	On a totally standard car; custom file
Toyota GR Performance Software	—	—	+20 Nm, to 390 Nm	Fitted by Toyota; Toyota says it doesn't affect the new-car warranty
DTE PowerControl X	—	+40 PS	—	Plug-in module

Before you buyAsk which fuel the file is written for: the UK figures here are on 99 octane, and Israel sells 98 at most. In Israel the GR Yaris isn't sold by the importer, so cars here are personal imports (Calcalist): check what the warranty covers. Toyota's own software is sold through GR Garages in Japan, and its "Competition" version voids the factory warranty on the four-wheel-drive system (Toyota Japan).

2

Stage 2: Intercooler, intake, exhaust and cams

320–350 hp

Stage 2 adds a bigger intercooler, an intake and an exhaust with a file written for them. Forge's Stage 2 claims 320 bhp and 420 Nm, and Garage Whifbitz says a car with these parts usually makes around 330 bhp after a remap; its next step, Kelford camshafts and valve springs with a custom file, gets about 350 bhp from the factory turbo (its guide).

Typical cost: Eventuri intake £1,344–£1,450 (Collins Performance); Milltek filter-back exhaust £1,131.04 on sale (VUDU); Mishimoto intercooler for the GR Corolla $799.95 (Subimods).List prices, Sept 2026, before shipping, import tax and fitting.

Stage 2 packages compared

Package	Fuel	Claimed power	Claimed torque	Required hardware
Forge Stage 2	—	320 bhp	420 Nm	Forge's upgraded hardware
Garage Whifbitz Stage 0 + EcuTek	99 RON	about 330 bhp	—	Intake, exhaust, particulate-filter delete and intercooler
Garage Whifbitz customer car	99 RON	268 whp (≈323 bhp)	—	Airtec intercooler, filter delete, Remus exhaust, intake; 230 whp before the remap
Garage Whifbitz Stage 2	99 RON	about 350 bhp	—	Kelford cams and valve springs on top of Stage 1

Parts list

Intercooler required Forge FMINT25 intercooler Mishimoto intercooler (GR Corolla)Airtec
Forge claims air up to 20°C cooler and more than 10 bhp; Gen 2 cars with the water spray need its extra bracket.
Intake recommended Eventuri carbon intakeMST
Eventuri claims +15 hp and +18 lb-ft; its intake is listed for 2020–2023 cars.
Exhaust optional Milltek ECE-approved filter-back (Gen 2)Milltek filter-back (Gen 1)Milltek sports cat and downpipe (race)
Milltek's resonated Gen 2 system is ECE approved and sold through Toyota in Germany.
Camshafts and valve springs optional Kelford
The last step on the factory turbo, with a custom file.

Before you buyEuropean cars have a particulate filter, and filter deletes and de-cat pipes are motorsport parts: the Milltek bypass pipes "require Stage 2 ECU software" and fail inspection (the listing). The UK figures are on 99 octane; on Israeli 98 expect a little less.

3

Stage 3: Bigger turbo in the factory position

360–435 hp

Stage 3 replaces the factory turbo with a bigger one that bolts into its place. Garage Whifbitz fits two: a Midland hybrid for 360–380 bhp, and the Artec Sport 400, built on a Garrett G25-550 core, which it says has made up to 435 bhp on pump fuel (its guide). Artec says a stock GR Corolla in Australia made 220 whp, and 300 whp with its turbo and an EcuTek tune (Artec kit page).

Typical cost: Artec Sport 400 turbo kit £3,200 before VAT (£3,840 with VAT) at Garage Whifbitz.List prices, Sept 2026, before shipping, import tax and fitting.

Turbo upgrades compared

Kit	Fuel	Claimed power	Price	Notes
Artec Sport 400	Pump fuel	up to 435 bhp	£3,200 before VAT	Garrett G25-550 core; bolt-on with oil and water lines; works with the factory computer
Midland hybrid turbo	—	360–380 bhp	—	At Garage Whifbitz; figure depends on the car's specification
Artec Sport 400 on a GR Corolla	Pump fuel	300 whp	—	From 220 whp stock, tuned with EcuTek in Australia

Parts list

Upgraded turbo required Artec Sport 400Midland
Artec says the car's computer "SHOULD" be tuned straight after fitting.
Injectors recommended DeatschWerks
The Kanoo Performance car on Artec's page ran DeatschWerks injectors at this level.

Before you buyArtec's 412 hp dyno run was on 109-octane race fuel, not pump fuel. A changed turbo isn't road-legal in Israel without approval. Budget for the clutch: Garage Whifbitz's big-power cars run an uprated one.

4

Stage 4: Garrett turbo kit, Syvecs computer and built engine

415–470 hp

Past the factory-position turbos, builds move to a turbo kit with its own manifold and an external wastegate, which the factory computer can't control, so they need a plug-in Syvecs computer. On 99 octane at 2.0 bar, Garage Whifbitz says a G25-550 makes about 415 bhp and a G25-660 392 whp, about 467 bhp (its guide). Its forged, closed-deck engine with a G25-550 made 405 whp, about 480 bhp, on an E50 ethanol blend (the build).

Big-turbo builds compared

Build	Fuel	Claimed power	Boost	Notes
Garrett G25-550 kit	99 RON	≈415 bhp	2.0 bar	Syvecs computer
Garrett G25-660 kit	99 RON	392 whp (≈467 bhp)	2.0 bar	Syvecs computer
G25-550 with a forged engine	E50	405 whp (≈480 bhp)	—	Closed-deck block, Kelford cams, 1,100 cc injectors, uprated clutch

Parts list

Plug-in engine computer required Syvecs GR Yaris plug-in computer
It controls an external wastegate, flex fuel and launch control; Garage Whifbitz sells it for £4,300 before VAT.
Turbo kit and manifold required Lamspeed RacingGarage Whifbitz
Tubular manifold, Garrett G25-550 or G25-660 turbo and an external wastegate.
Built engine, fuel system and clutch recommended Garage WhifbitzDeatschWerksXtreme
Garage Whifbitz shows a failed engine and its forged, closed-deck rebuild in the same guide.

Before you buyEthanol blends aren't sold at Israeli filling stations, so look at the 99-octane figures and expect a little less on 98. The Syvecs computer for 2024-on cars is listed for manual cars only (SRD Tuning). Choose one shop to build, tune and stand behind the whole car.

Quick answers

How much horsepower does a stock Toyota GR Yaris have?: 261–280 PS from the factory, depending on the version.
How much hp does a Stage 1 Toyota GR Yaris make?: Tuners claim 300–310 hp at Stage 1, up from 261–280 PS stock (Stage 1 options).
How much hp does a Stage 2 Toyota GR Yaris make?: Tuners claim 320–350 hp with a Stage 2 file and the parts it needs (parts list).
How much hp does a Stage 3 Toyota GR Yaris make?: Tuners claim 360–435 hp at Stage 3: bigger turbo in the factory position (Stage 3 parts).
How much hp does a Stage 4 Toyota GR Yaris make?: Stage 4 is the top of the ladder for this car: garrett turbo kit, Syvecs computer and built engine. The biggest builds claim 415–470 hp. Check which fuel each figure needs: Israel sells 95 and 98 octane only (Stage 4).
How much does a Stage 1 Toyota GR Yaris cost?: List prices: Forge remap £400, done at Forge; Toyota's GR Performance Software ¥99,000–¥265,100 in Japan.

Watch: real builds

From tuners', shops' and motoring journalists' own YouTube channels. Nothing loads from YouTube until you press play.

Track testA 600 hp tuned GR Yaris drag-races a GT-R NISMOcarwow on YouTube

BuildAn 800 bhp GR Yaris build with a sequential gearboxOFFICIALLY GASSED - OG on YouTube

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Questions to ask the shop

Is my car a 2020–2024 car or the updated 2024-on car, and do you have a file for it, manual or automatic?
Is the file written for 98 octane, and what does it make on 95?
Does it keep the particulate filter and catalyst working, so the car passes inspection?
Do you log intake-air temperature, and at which stage do you require a bigger intercooler?
At what torque do you insist on an uprated clutch?
Is my car a personal import, and does that change the warranty or the parts you can get?

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