Fits 2018–2024 · Stage 1 and Stage 2 · Mail-in
$2,499
Stage 1
425hp
440lb-ft
From 354 hp / 369 lb-ft stock
The car
With the B9 generation, introduced for the 2018 model year, the S4 changed its powertrain on two counts. A single twin-scroll turbocharger replaced the supercharger on the 3.0-liter TFSI V6, and an eight-speed Tiptronic automatic with a torque converter took the place of the B8.5 car’s seven-speed S tronic dual-clutch and six-speed manual, so the US car has been automatic only since.
quattro all-wheel drive is standard, and a sport rear differential was available to shift torque between the rear wheels in corners. Audi quotes 0–60 mph in 4.4 seconds.
In the US the S4 is sold only as a sedan. The S4 Avant wagon offered in Europe never came here, so buyers who wanted the same drivetrain in a different shape had the S5 Coupe, Sportback and Cabriolet to choose from. Of the four B9 S bodies, the S4 is the only conventional sedan with a separate trunk.
Stage 1 is calibrated for the car as it left the factory and takes it from 354 hp and 369 lb-ft to 425 hp and 440 lb-ft on pump-grade fuel. Stage 2 is calibrated for supporting bolt-on modifications and high-octane fuel, for 460 hp and 480 lb-ft. The gearbox has its own controller and torque limits, so the optional TCU tune raises them to match, with sharper shifts and stronger clutch clamping.
Figures & prices
Factory and tuned horsepower and torque from our catalog, with prices for each stage and add-on.
| Model year | Factory | Stage 1 | Stage 2 | Add-ons |
|---|---|---|---|---|
| 2018–2024 | 354 hp / 369 lb-ft | 425 hp / 440 lb-ft $2,499 | 460 hp / 480 lb-ft $2,499 | TCU tune $2,499 |
Tuned figures are estimates, not guarantees. Actual results vary with the car’s condition and modifications, fuel quality and octane, temperature, altitude and the dyno used. See our Terms of Service.
How it works
Choose your year, stage and add-ons and check out securely.
Pack it with your printed order confirmation email and send it to our Phoenix shop.
Within two business days of it arriving.
Return shipping is on us. Reinstall and drive.
FAQ
More answers in our FAQ
Our online catalog lists Stage 1 and Stage 2 tunes for 2018–2024 Audi S4 (B9) models. Choose your year at the top of the page; the figures and prices are the same for every year.
Check the gearbox and the engine. The B8.5 S4 has a supercharged 3.0-liter V6 with either a six-speed manual or a seven-speed S tronic dual-clutch. The B9 has a turbocharged 3.0-liter V6 and is only available with the eight-speed Tiptronic automatic.
Under the skin, largely yes: the B9 S4 and S5 share the turbocharged 3.0-liter V6, the eight-speed Tiptronic and quattro. The S4 is the four-door sedan, while the S5 comes as a Coupe, Sportback or Cabriolet. The S5 has its own page, S5 (B9).
Stage 1 is calibrated for the car as it left the factory and runs on pump-grade fuel. Stage 2 pairs the calibration with supporting bolt-on modifications such as downpipes and runs on high-octane fuel. On a 2024 car, Stage 1 takes it from 354 hp to 425 hp. Stage 2 takes it to 460 hp.
A TCU tune is available as an add-on ($2,499). It raises the transmission’s torque limits and sharpens the shifts so the gearbox can handle the extra power. Ship your TCU in the same box as your ECU.
More Audi tunes
Contact
Customers across the US order online and mail us their ECU. Our shop is at 952 W Melinda Ln, Suite D in north Phoenix (Deer Valley, 85027), and local owners are welcome to bring their car in. Call, visit or send us an inquiry.