In Reply to: ALSO unimpressed with 3.15!!(more) and L-O-N-G posted by 540Power on July 06, 2000 at 14:31:40:
My experience coming from a 2.81 to a 3.15 on my 00 540/6 is crisper acceleration, covers more pavement with the same effort, and a nice 6th gear now. The car is ready to pounce much more so.
I would say my experiences are about a 3-5% increase in quickness. About the same as the ECU upgrade. Every mod inches you up. The only HUGE mod that I have seen is the SC... which kills your warrantee and you wallet.