The Top 10 Most Highly Tuned NASP Engines - No.3
3. Audi R8 V10 Plus
One way to ensure two entries in the NASP hall of fame is to take one engine that's already made it, and add two more cylinders!
With a 5.2 litre V10 producing 413lbft, the specific torque is strong if not world-class at 79lbft/litre, but like it's smaller sibling it tops the leaderboard for piston speed, punishing the pistons with an absolutely brutal 25.5m/s at it's 8250rpm redline.
With 610bhp out of a theoretical maximum of 692 the Audi R8 V10 Plus ranks 3rd with an NA PI of 881.