oh also found this video of a c5 rs6(v8tt, 4klbs without driver and fluids, full size 4dr sedan) with a chip air filter and mufflers against a 646whp 3.4l crower stroker supra with a precision t67 turbo...
YouTube - HD: Toyota Supra 646 RWHP vs MTM Audi RS6 Sedan: GTBOARD.com


nice to know that when you buy a turdbox(audi) you can get 730hp to the crank not press the gas all the way to the floor and beat a supra equipped with some nice shit while giving him the benifit of a rolling start!lol..that supra sounds nasty and is quick tho.