Despite the hemi engine's weight , the car was a blast to drive. Note that the engine was a crate ray barton hemi engine with a displacement of 525ci and 775 horsepower, he also changed a lot of thing in his car including front and rear bigger brakes, torsion bars, rear leaf springs, stabilising bars and rear axle. On the hot rod power, the guy reached a speed of 180mph. I know also a Swiss Driver Roger Bolliger who is a well known vintage Pontiac collector who races a 1970 transam with a crate 494ci +700hp butler performance engine and he won several races. An r8 with the w12 must be insane to drive. Back in the days of can am racing (1968-1972), the big block chevy zl 1 v8s allowed the mc laren race team to win and dominate all the races and in straight lines, the m 8 could reach 370km/h .