Nice easy one this, as with 4.2 litres spread over 2 banks, thats just over 2 litres per bank, which means there are LOTS of possible turbo's to choose from. Basically, you gota choose between
Product Information. VF-Engineering chose to supercharge the Audi S4 4.2 liter to provide a blistering launch from a standstill with a water cooled roots type Eaton TVS1900 supercharger. VF Engineers knew that only a roots type supercharger would give a torque increase needed to satisfy the hungriest enthusiast.
PES supercharger kits for 4.2 A6, A8, AR and S6 vehicles. It may be time to buy a V8 Allroad or S6 and just throw a supercharger on it. Much easier than my plan to stuff a 4.2tt in one of those. wow thats in increadible deal$8500 for 30-40% more power
The 2.7-litre S4 is powered by a 265bhp twin-turbocharged V6 engine capable of rest to sixty in under 5.5s on the way to an artificially limited maximum of 155mph. A six-speed close-ratio gearbox. And quattro four-wheel drive, so that, unlike your rival M3 driver, you can get all that power onto the tarmac.Price is a huge thing though, the S6/S8 Custom Intake Manifold and Supercharger start around $15,000, so that in itself trumps the value of the car, but if you can find a way to justify it then go right ahead. One can only imagine the power you could achieve with these parts coupled with a good tune and exhaust system.