Quote:
Originally Posted by mfanatic325
I have the SS unresonated x-pipe and the SS race muffler canisters, and felt zero discernible difference in power. In unopened/untouched NA form, the S54 with MSS70 ECU pretty much only gains power by changing out the 2-to-4 catalytic converters (depending which market your car was produced for), along with a tune. Every other bolt-on mod is trivial unfortunately. And anything more than that (altering engine internals) requires significant investment in terms of time/cost  |
This was my thinking as well, I've got the full aftermarket Intake/Header/S1/S2/Muffler/Tune sha-bang. Got curious as those dynos looked like they had different peaks, but wasn't sure what the comparisons were of. Would be interesting to see!