Fits 2012–2018 · Stage 1 and Stage 2 · Mail-in
$2,499
Stage 1
700hp
750lb-ft
From 577 hp / 556 lb-ft stock
The car
Audi’s D4 S8 is the performance version of the A8 of its generation, sold in the US on the standard wheelbase only. Its 4.0-liter twin-turbo V8 places the turbochargers and intercooler inside the vee, and cylinder on demand lets it run on four cylinders at light load. An eight-speed Tiptronic automatic drives all four wheels through quattro with a sport differential that varies torque between the rear wheels.
From the 2016 model year the higher-output S8 plus replaced the regular car in the US, and it remained the only S8 offered through 2018. It added an overboost function, and its Dynamic package brought ceramic brakes, a sport exhaust, a carbon lip spoiler and a 190 mph top speed.
The D5 that followed is long-wheelbase only in the US and adds a 48-volt mild-hybrid system; it has its own page, S8 (D5).
Stage 1 is calibrated for the car as it left the factory and takes it from 577 hp and 556 lb-ft to 700 hp and 750 lb-ft on pump-grade fuel. Stage 2 is calibrated for supporting bolt-on modifications and high-octane fuel, for 740 hp and 800 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 |
|---|---|---|---|---|
| 2012–2018 | 577 hp / 556 lb-ft | 700 hp / 750 lb-ft $2,499 | 740 hp / 800 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 2012–2018 Audi S8 (D4) models. Choose your year at the top of the page; the figures and prices are the same for every year.
Check the wheelbase and the electrical system. In the US the D4 was sold on the standard wheelbase and has no mild-hybrid assistance, while the D5 is long-wheelbase only and has a 48-volt system, predictive active suspension at launch and all-wheel steering. The D5 is listed on its own page, S8 (D5).
A higher-output D4 that took over from the regular S8 in the US for the 2016 to 2018 model years. Besides more output and an overboost function, it could be ordered with a Dynamic package that included ceramic brakes, a sport exhaust, a carbon lip spoiler and a 190 mph top speed.
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 2018 car, Stage 1 takes it from 577 hp to 700 hp. Stage 2 takes it to 740 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.