My 1998 A4 3.15 gear convertible ran the same mph at 13.40s. 87000 miles all stock except 2002-2004 Z06 air cleaner housing. Added Z06 wheels and tires, LS6 intake, Z06 Titanium cat back and Vararam. Picked up 2 tenths and 2 mph. 60 foot was 2.0 and manually shifting just short of rev limiter would add 1mph. 13.27 @ 106mph.