Audi TT RS 8JStage 1 to Stage 4 tuning guide

The Bosch MED 9.1.2 engine computer can be flashed through the OBD port by most tuners; APR says its first flash on newer cars goes through the computer's board, then by OBD. On 95 or 98 octane the files claim 380–420 PS, and APR measured the stock car at 374 hp before its tune (its page).

Typical cost: remaps $526.95 (APR), $625 plus a $180 cable (034), €650 (BR-Performance), €599–€799 (TVS) or €999 fitted (HPerformance); S tronic software from £500 before VAT (TVS); plug-in boxes €499 (RaceChip) or €799 (DTE).List prices, Sept 2026, before shipping, import tax and fitting.

Stage 1 tunes compared

Integrated Engineering, Eurodyne and Cobb list nothing for this car. APR's and Unitronic's gearbox software is for the 2017+ TT RS only.

The S tronic and the manual clutch

Stage-X-Tuning says the stock S tronic computer cuts engine power at its Stage 1 torque of about 610 Nm (its page), and BAR-TEK says the stock DQ500 clutch pack "often slips at 650 Nm" (its page). TVS Engineering is the only tuner found with gearbox software for the 8J: 600 Nm at Stage 1, 700 Nm at Stage 2 and 800 Nm at Stage 3 on the stock clutches, from £500 before VAT (PERON, its UK partner). On the manual, Sachs rates its organic performance clutch at 550+ Nm, below what most Stage 1 files ask for, and its sintered racing clutch at 810+ Nm (Sachs).

The intercooler comes first. REVO calls an uprated one "a must" for Stage 2 and useful even at Stage 1 (its page), and Forge measured 72 °C air after three pulls on the stock unit against 35 °C with its own. With a downpipe as well, the files reach 419–454 PS, which is about the limit of the stock turbo: HPerformance calls its 450 PS kit "up to 450 hp on series turbochargers".

Typical cost: intercooler $1,255.50 (Forge) or $1,480–$1,830 (Wagner); downpipe $1,480 (Wagner) or from €1,999 (HPerformance); cat-back exhaust £1,043.01–£1,240.07 (Milltek); manual clutch €647.10–€744.35 (Sachs).List prices, Sept 2026, before shipping, import tax and fitting.

Stage 2 tunes compared

Parts list

• Intercooler required Forge FMINT2TTRSWagner EVO 2Wagner EVO 3CTS Turbo (ECS Tuning)AIRTEC

  Forge's holds 15.7 litres against the stock 6.8 ($1,255.50 on sale). Wagner's EVO 2 costs $1,480 and its EVO 3, rated up to 600 hp, $1,830. CTS's is $959.99 at ECS Tuning, and AIRTEC's £478.55 before VAT means cutting the crash bar. Forge's RS3 8P intercooler doesn't fit the TT RS.

• Downpipe not road-legal Wagner downpipe kitHPerformance 90 mmScorpionMilltek secondary-cat bypass

  Wagner's kit has two 100-cell catalysts ($1,480). HPerformance's 90 mm pipe starts at €1,999, and its 400-cell version is TÜV-approved only with HPerformance software. Scorpion's costs £884.54–£1,146.05, and Milltek's bypass for the second catalyst £252.70. No ECE-approved downpipe was found for the 8J.

• Exhaust optional Milltek cat-back / turbo-backScorpion cat-backSupersprint (EEC)HPerformance ECE

  Milltek's cat-backs (£1,043.01–£1,240.07) keep the valve and need no tune; its turbo-backs (£1,684.15–£2,694.71) need one. Scorpion's valved cat-back is £867.36 at AwesomeGTI, Supersprint's 76 mm rear section has EEC approval, and HPerformance's ECE system starts at €2,999.

• Intake optional 034 X34 carbon intakeCTS Turbo intakeBMC FB382/01K&N 33-2384Pipercross

  034 claims up to 16 hp from its $959 intake on stock-turbo tunes, and CTS 9–15 hp from its $379.99 one. Panel filters from BMC, K&N (£56.66) and Pipercross (£41.99) all list the TT RS.

• Diverter valve and pipes above 450 hp Forge diverter valveTTE 63 mm pressure pipe034 catch can034 spark plugs

  Forge's valve (from £377.27) replaces the stock one that errors at high boost. TTE's pipe starts at €230 before VAT, 034's catch can costs $716, and 034 lists Denso IKH24 plugs at $23 each.

• Clutch or gearbox software for the higher files TVS S tronic softwareSachs Racing clutchSachs Performance clutchRTS twin frictionDutter 850 Nm clutch

  TVS's 700 Nm S tronic software costs £500 before VAT. For the manual, Sachs's racing clutch is €647.10 (810+ Nm) and its organic one €744.35 (550+ Nm); Dutter's Sachs-based sintered clutch is sold as 850 Nm (€880).

Past 450 hp the stock turbo has to go. The upgrade turbos below bolt on in its place and keep the stock engine internals. Fuel decides a lot here: 034's RS500 kit makes 468 hp on 95 octane and 515 hp on 100-octane race fuel (its figures), and BAR-TEK's own CEPA guide says 102 octane is "mandatory" for all its stages (its guide). On Israeli 98, water-methanol injection is the usual way to get close to the higher figures.

Typical cost: 034 RS500 kit $5,407; Loba LO500P €3,395; Turbo-Total 550 €2,637.78 before VAT; fuel-pump upgrade $390 (034) to €840.29 before VAT (BAR-TEK).List prices, Sept 2026, before shipping, import tax and fitting.

Turbo upgrades compared

Parts list

• Upgrade turbo required 034 RS500Loba LO500PTurbo-Total 550MuchBoostTTE500+

  Each needs its own file, plus the Stage 2 intercooler and exhaust. 034 and BMP say a performance clutch is required for the race-fuel file.

• High-pressure fuel pump required Loba HP25Autotech kit034 piston kitBAR-TEK pumpVIS Motorsport

  These do the same job: most fit a bigger piston (about 11.5 mm against the stock 9.98 mm) into the stock Hitachi pump, so pick one. The 034 kit costs $390, Autotech's €283.33 before VAT at TTE, Loba's HP25 €799.95 and BAR-TEK's complete pump €840.29 before VAT. Each needs the software adjusted. APR's pumps show "not available".

• Water-methanol injection for 98 octane Snow Performance (340 PS)Snow Performance (360 PS)

  Snow Performance lists separate kits for the 340 PS and 360 PS cars, from €449 to €969. It cools the intake air and gives the file more knock margin on pump fuel.

Above about 550 hp the builds get bigger turbos, forged internals, more fuel and a stronger gearbox. Sportignition says the stock main bolts must be replaced above 550 hp (its page), and BAR-TEK's 650 hp stage uses forged pistons and rods, a reinforced clutch and an oil cooler, on 102 octane (its guide). TTE says its TTE700 makes "over 600 PS on pump petrol", and a UK dealer quotes 650+ PS for the TTE777 on 99 octane.

Stage 4 options compared

Parts list

• Forged rods and pistons required BAR-TEK JE piston and rod setIE Tuscan rodsFCP X-beam rodsPauter rodsMahle Race V2 pistonsCP pistonsSTR 1,000 hp kit

  BAR-TEK's set of JE pistons, its rods and bearings costs €1,556.43 before VAT. IE's rods ($938.99) and FCP's X-beam rods (€719) are rated to 1,000 hp, Pauter's (€2,171.75) over 1,200 hp, and Mahle's pistons (€1,260.46 before VAT) "700 PS and much more". STR's kit for up to 1,000 hp is €2,749.96.

• Built short block instead of parts Tij-Power CEPA short blockTHE billet main capsARP head studsARP main studsSTR cylinder-head kit

  Tij-Power rebuilds your block with forged pistons and steel rods, ready for up to 800 PS, from €3,499. Billet main caps fit the CEPA only (€780 before VAT, needs line boring); ARP head studs cost €277.90 before VAT and STR's head kit €1,833.29.

• Fuel system required BAR-TEK RSX injectorsBAR-TEK port-injection manifoldJDY in-tank pump kitSyvecs S7Plus

  BAR-TEK's direct injectors are for over 600 PS (€1,945.55 before VAT). The CEPA has no port injection, and BAR-TEK's manifold with five extra injectors (from 650 hp, same price) needs a separate computer to drive them, such as the Syvecs made for this engine ($5,709). JDY's twin-pump in-tank kit costs $1,100.

• Cooling required Wagner EVO 3.X intercoolerCTS intercoolerBAR-TEK oil coolerHEL oil cooler

  Wagner's EVO 3.X is for above 600 hp ($2,060) and CTS rates its core past 650 hp ($1,199.99). Oil coolers cost €782.69 before VAT (BAR-TEK) or from £460.30 (HEL).

• Gearbox and driveline required TVS 1,000 Nm software and clutchBAR-TEK 1,000 Nm clutchDutter 1,100 Nm clutchBAR-TEK flywheelWavetrac (manual)Quaife (S tronic)HPA Haldex controller

  TVS sells 1,000 Nm software with its race clutch for £2,455.50 before VAT. BAR-TEK's clutch pack costs €1,945.55 before VAT and Dutter's €2,450. BAR-TEK and Dutter both warn against a single-mass flywheel, which can break the five-cylinder's crankshaft; BAR-TEK's reinforced dual-mass one is €1,556.43 before VAT. Wavetrac ($1,795) and Quaife (£1,547.32) sell front differentials, and HPA a Haldex controller ($1,349).

Check first whether your car has Audi magnetic ride. Most coilovers come in two versions, and cars with it need a cancellation kit so the dashboard doesn't show faults. The stock brakes are 370 mm at the front and 310 mm at the rear, and the stock wheels are 19×9 ET52.

Suspension

Brakes

• Big brake kits maker lists it Brembo GTS 380 mm (ECS Tuning)Movit 380 mmVagbremtechnic AP Racing 362 mm

  Brembo's six-piston GTS kit costs $5,095. Movit's 380×32 mm discs keep the stock calipers and come with a German parts certificate (€1,949 with pads and lines), but need 19-inch wheels. Vagbremtechnic's AP Racing kit fits under most 18-inch wheels (£2,974.40).

• Discs, pads and lines maker lists it Girodisc 2-pieceParagon 2-pieceZimmermann (ECS Tuning)EBC YellowstuffFerodo DS PerformanceHEL lines

  Girodisc's lighter two-piece front discs cost $1,150 a pair and Paragon's $1,050; Zimmermann's stock-type pair is $837.99. EBC's Yellowstuff (£166.22 front) and Ferodo's DS Performance (£248.85) pads are R90 road-approved, and HEL's braided lines cost £119.60.

Wheels and body kit

• Wheels dealer lists it OZ Ultraleggera HLTBBS CC-R (ECS Tuning)Rotiform DTM (ECS Tuning)Borbet Y

  OZ's 9×19 ET48 set costs €2,420 at a German dealer, BBS's CC-R set $3,650.99 and Rotiform's DTM set $1,479. Borbet's 18-inch Y set (€732) needs no registration in Germany.

• Body kit maker lists it CSR swan-neck wingCSR front lipMaxton front splitterMaxton side skirts

  CSR's rear wing (from €1,199) and front lip (€169) come with ABE approval, so they need no registration in Germany; the wing replaces the stock spoiler lip. Maxton's splitters and skirts cost $184 each, but carry only a material certificate, not a road approval.