Build Ladder עברית

All cars › Korean › Kia

Kia Stinger GTStage 1 to Stage 4 tuning guide

The Stinger GT's 3.3 twin-turbo V6 answers software unusually well: US tuners measure about 310–330 whp from a stock car and 380–480 whp after a tune. Almost every engine part also fits the Genesis G70 3.3T. The limits are spark plugs, the stock head bolts, the fuel pump and heat in the automatic gearbox.

Years: 2017–2023 (facelift from 2021)
Engine: 3.3 T-GDi twin-turbo V6 (Lambda II)
Gearbox: 8-speed automatic, RWD or AWD
Stock power: 365–368 hp (US) / 370 PS (EU)

Power by stage

Stock is Kia's engine figure. Stage 1 to 4 are the tuners' own figures at the wheels (whp), mostly on US 91–93 octane, which is about 95–98 RON in Israel. The top of Stage 2 to 4 needs methanol injection or ethanol.

Stock365–370 hp

Stage 1380–480 whp Stage 2430–530 whp Stage 3450–650 whp Stage 4650–900+ whp

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

Software, with new plugs

380–480 whp

A flash tune takes the Stinger GT from about 310–330 whp to 380–480 whp, depending on fuel (LAP3's figures on a Dynojet). The JB4 piggyback is the most common alternative and needs no flash. European tuners quote engine figures: BR-Performance claims 400 hp and 610 Nm from the 366 PS car.

Typical cost: JB4 $599–$799; flash tunes $499–$1,500 (Weistec, Tork, LAP3) or €780 (BR-Performance); plug-in modules €499–€899 (RaceChip, DTE); gearbox tune $150–$1,250 (Burger, Tork, LAP3).List prices, Sept 2026, before shipping, import tax and fitting.

Stage 1 tunes compared

Tune	Fuel	Claimed power	Claimed torque	Notes
LAP3 Stage 1.0 / 1.5	91+ / 93+ US	380–460 / 410–480 whp	—	HKS M45iL plugs required; 2018–24 cars
SleepyTuned custom tune	91 / 93 US	about 420 / 440 whp	—	Its own estimates; flashed remotely
Burger JB4	91 US minimum; 91 / 93 / E85 maps	up to +100 whp	up to +100 wtq	Piggyback, 2018–23; 5-year warranty
Tork Stage 0 / Stage 1	91 / 93 US	up to +70 / +100 whp	up to +70 / +100 wtq	Engine computer sent in; Stage 1 needs intakes and HKS plugs
Weistec Lambda II tune	premium	415 hp	406 lb-ft	Engine estimate; Cypher tool, no unlock needed
BR-Performance Stage 1	—	400 hp	610 Nm	European car; 2-year warranty
DTE PowerControl X	—	+62 hp	+147 Nm	Plug-in module for the European 366 PS car
RaceChip GTS 5	—	+58 PS	+180 Nm	Plug-in module

Recommended with Stage 1

New or colder spark plugs required HKS M45iLNGK
Burger says spark blow-out is a known issue even at stock boost; LAP3 and Tork require HKS plugs.
Gearbox (TCU) tune recommended LAP3 TCU tune Tork 8-speed TCU tune Burger TCU map
More line pressure and higher torque limits; SleepyTuned says the stock gearbox computer cuts torque on a tuned car.
Gearbox oil cooler hot climates BMS transmission cooler CSF Concept 3 cooler
Burger "strongly suggests" one for higher power or hot climates, which fits an Israeli summer.

Before you buyCheck the tune supports your model year: Burger's maps cover 2018–2023 and LAP3's 2018–2024. US 91 octane is about 95 RON and 93 about 98 RON. Kia's warranty excludes "alteration, modification, tampering".

2

Downpipes, intake and cooling

430–530 whp

Stage 2 adds downpipes, intakes and a bigger intercooler with a Stage 2 file. LAP3 claims 430–500 whp on 95+ octane, and 460–530 whp with methanol injection, which it requires for that file. Tork puts the stock fuel system's limit at about 470 whp without methanol.

Typical cost: downpipes $599.99–$695.75 (Circuit Werks, ARK); intake $379–$629.99 (BMS, aFe, K&N); intercooler $779 (BMS) or $1,499.95 (Mishimoto); Burger 450 whp package $1,299–$1,399.List prices, Sept 2026, before shipping, import tax and fitting.

Stage 2 packages compared

Package	Fuel	Claimed power	Claimed torque	Required hardware
LAP3 Stage 2.0 / 2.5	95+ / 98+ or with meth	430–500 / 460–530 whp	—	Bolt-ons; methanol injection required for 2.5
Burger 450 whp package	—	over 450 hp	—	JB4PRO, intake, catch can and plugs
Tork Stage 1+	with meth	+100 whp and more	+150 wtq and more	Full exhaust, intercooler and methanol

Parts list

Downpipes required ARK Performance downpipes Circuit Werks downpipesNGT
The V6 has primary and secondary downpipes; ARK's secondary pipes also fit the G70.
Intake required aFe Takeda intake K&N Typhoon intake BMS dual intake
aFe claims +22 hp; K&N measured +9 hp at the wheels.
Intercooler recommended Mishimoto intercooler kit BMS intercoolerWagner
Mishimoto measured +8 whp on a stock tune and 6 whp more on Stage 1.
Fuel for the top of Stage 2 BMS fuel pump upgrade BMS charge-pipe injection BMS charge pipe
Burger calls the factory high-pressure pump the limit.
Cat-back exhaust optional MBRP cat-back MagnaFlow cat-back
Mostly sound; these are Stinger-specific and don't fit the G70.

Before you buyCatless downpipes won't pass inspection, and SleepyTuned and TurboKits both say they can make the engine smoke or burn oil. Methanol and ethanol aren't sold at Israeli filling stations.

3

Hybrid turbos and head studs

450–650 whp

Stage 3 upgrades both turbos. LAP3's hybrid files claim 450–550 whp on 93 octane and 500–650 whp with methanol, and TurboKits measured 615 whp on E30 and methanol with its TK700 turbos. From here the head needs studs: SleepyTuned says the stock torque-to-yield head bolts are shared with the non-turbo 3.3 and recommends studs above about 480 whp.

Typical cost: hybrid turbos $1,649.99 with core exchange (Pro Xe), $3,495 (TurboKits TK700) or €2,539.09–€3,108.20 (Muchboost); head studs $695.50 (Tork); port injection $1,999 (BMS).List prices, Sept 2026, before shipping, import tax and fitting.

Hybrid turbos compared

Turbos	Fuel	Claimed power	Claimed torque	Notes
TurboKits TK700	E30 + meth	615 whp	594 wtq	Head studs needed above 22 psi; fits the G70
Muchboost 570 / 600 / 650	—	about 570 / 600 / 650 hp	—	Engine figures; fits the G70
Pro Xe LAMDA-680	—	supports 680 bhp	—	A hardware rating; fits the G70
LAP3 Stage 3.0 / 3.5 files	93+ / with meth	450–550 / 500–650 whp	—	For upgraded turbos

Parts list

Hybrid turbos required TurboKits TK700 Muchboost hybrids Pro Xe LAMDA-680
Each needs a tune written for the new turbos.
Head studs required Tork head stud kitARP
LAP3 wants studs and block thread reinforcement from about 500 whp.
Port injection for ethanol BMS port injection kit
Six extra injectors and a pump; Burger claims up to 900 whp on E85.
Gearbox upgrade recommended Lambda Raceworks 8-speed build
A rebuilt automatic; no torque rating is published.

Before you buyTork says the valve springs float above 7,400 rpm and recommends a 7,200 rpm limit. The biggest figures need E30 or methanol, which aren't sold at Israeli filling stations.

4

Big turbo kits and built engines

650–900+ whp

Stage 4 replaces the turbos and manifolds with a big-turbo kit, and at the top builds the engine. IMR claims more than 900 whp from its twin-turbo kit, and SleepyTuned says builds beyond 650 whp need forged internals and an upgraded drivetrain.

Parts list

Big twin-turbo kit required IMR twin-turbo kit LAP3 twin XT26 kit
Manifolds, turbos, wastegates and downpipes; both fit the G70 too.
Built engine required Lambda Raceworks "Bulletproof" 3.3 Lambda Raceworks 4.1 race engine
Studs and block inserts, or a 4.1 with forged pistons and a 12-month warranty.

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

Watch: real builds

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

Stages 1–2Burger Motorsports: a JB4 Stinger on the dyno, with its intake and E30Burger Motorsports on YouTube

Stage 3TurboKits explains its TK700 hybrid turbos for the Stinger 3.3TurboKits.com on YouTube

BuildBurger Motorsports chases 800 whp with a Kia StingerBurger Motorsports on YouTube

All build videos, by car

Questions to ask the shop

Which flash tool and file do you use, and does my engine and gearbox computer's calibration support it?
Is the file written for 95 or 98 RON without ethanol, and what boost does it run at peak and at 6,000 rpm?
Which plugs do you require, and from what power do you insist on head studs?
Will you tune the gearbox too, and do I need a transmission cooler for summer heat?
Which downpipes keep their catalysts so the car passes the annual inspection, and can it go back to stock?
Do you log and revise the file afterwards, and what happens to my warranty?