Had a chance to mess around with an 04 GLI Jetta tonight. His mods included: AEM CAI and REVO tuned ECU. Mine are: AEM CAI ( ) and open DP.
REMEMBER!!! All events took place on a closed track.
Ran maybe 10 to 12 times total. From a stop I completely destroyed him. We also went from 30, 40, 45, 50, 60, and 75mph up to around 120ish. From 30 and 40 I would get the jump at the beginning (maybe 1 car length) and then he would start to catch up by 120. From 45 on up, whoever got the jump would get ahead and stay ahead by maybe .5 car length the whole way.
Overall these VWs seem like very nice cars. The ECU tuning really sets them free.
Cliff's Notes: From a dig: AWD FTW
From a slow roll: Me
From a fast roll: Driver's race.