Originally Posted by rays 335i
not to hijack but could someone point me to a dyno comparison of stock vs. aftermarket dps?i have read more /better turbo spooling ,quicker response, and the hp gains are comparable to a good e85 mix. don't get me wrong these are all good improvements but would like to see independent dyno .before and after.
There's really no point in getting downpipes on a stock vehicle. You will find nearly 60WHP just getting a tune and keeping everything else stock.
Downpipes mated with a tune can yield about 20WHP on top of the gains from the tune. (maybe even a little more).