2020 Audi S4. VEHICLE TYPE front-engine, all-wheel-drive, 5-passenger, 4-door sedan. PRICE AS TESTED $62,840 (base price: $50,895) ENGINE TYPE Audi 077-Series V8 32 / 40V Guru. Best power modification for the B6 S4, is either it's turbocharged, or the entire 4.2 V8 is yanked in favour of a much more robust (and tuneable) 2.7T. S5 4.2 350bhp VS RS5 4.2 450bhp. The RS5's engine is essentially a chopped version of the 10 cylinder used in the R8 5.2 and the Gallardo. The S5's 4.2 V8 I believe is more or less the same engine as the B6/7 S4 (obviously with some updates and minor re-workings), which was a completely different engine. The O2 sensors of course are down on the exhaust header pipes--the front ones that is. You can just barely see them (maybe) if you look about a foot down back at the far rear of the motor on the two sides. A better view requires pulling the air box, MAF and intake tube that leads to throttle body. Save up to $4,640 on one of 7 used 2004 Audi S4 Wagons near you. Find your perfect car with Edmunds expert reviews, car comparisons, and pricing tools. PLENTIFUL POWER WITH 4.2L V8 ENGINE Upon introduction, the B6 Audi S4 is one of the quickest sport sedans in its class. Standard power is courtesy of a 4.2 liter V8 which produces 339 horsepower and 302 lb-ft of torque. The five-valve per cylinder all aluminum V8 is also surprisingly lightweight. People have just used a hone to rough up the surface for new rings, however if your going to build the engine, you will need over sized pistons as tolerances for that engine are very tight, meaning a hone job will probably take too much material off. 02-23-2010 10:35 PM #13. 650RS. Registered Member Two Rings. .

audi s4 4.2 v8 motor