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A 3.15 gear means you have an auto trans
stock is 350 crank HP
CAI average 10 HP
better exhaust 10 HP
Tune 10-15 HP ( these cars are already well tuned bone stock)
this gives you about 385 crank HP
subtracting 20% for drivetrain loss on an A4 would give you about 308 RWHP
My experince at the track-- with stock tires you can expect about a 13.30 in the 1/4
With drag radials maybe about 13.00
The best mod you can do is a stall conveter which can subtract another 2-4 tenths
but tracton will become most important
I assume you mean 60' time and not 0-60 times---racetracks don't record 0-60
with stock tires you can expext 2.0 60' times
and with drag radials maybe 1.8 60' times
You are 100% correct it is an auto noted by the 3:15 rear. As far as
0-60 times I have heard and read as high as 5 sec to a low of 4 sec's
for a stock 2002-04 A4 but couldn't find anything that notes the 3:15 rear plus the upgrades noted above.