Originally Posted by Road racin
Did you notice any performance difference... Or just a sound change?
I did it right after break-in period, so I didnt get to go hard on the M5 beforehand to have a real comparison.
Also on the dyno, the M5 would make substantially more HP after each run since the computer got adjusted to driving style each time. So if you drive the car around more timidly day to day, just doing a couple WOT runs you can notice a feel of HP increase.
Let's face it though 8HP on a 550HP car isn't going to have much of a feel.
I wanted to keep my warranty, so downpipes and tune really arent an option. Intake and exhaust should help me edge out a stock M5 and keep me under warranty.
Just my two cents.