I have a 2002 C5 Coupe with an A4, 3.15 rear, Ti exhaust, Halltec intake and a Chuck CoW tune, I went to the track (1/4 mile) and raced 2 C6 Vettes, First one was a 2005 6 speed stock and the other was a 2006 A6 and I was surprized I took them both, It was my first time at the track so I was a newbe for sure. Maybe the next stock C6 I come up aginst will take me (It should), Like I said I was very surprized, Chuck at CoW does a great tune, That had to be what it was, Because I know I am not that good of a racer.
Bill K

 

Holy COW! Good racing Bill!

 

LOL, Thanks.
Bill

 

I totally agree with SCM_Crash on the stock for stock c5z vs ls3 c6. Ive ran both 6spds and the a4s. I got out better than i thought 1st thru 4th gears my pull definently slowed down after 115mph with the lights up against an a4 ls3 i was still pullin on it. I think the z's gear ratios give it a good advantage over the m6 gear ratios aswell as the a4s.