Quote:
Originally Posted by pokeybritches
I have two supercharged Z4M's running stepped headers (SS V1 and CPI), so Z4M's can definitely be tuned for them. I know stepped headers are Supersprint's premier S54 product, Evolve is a Supersprint distributor, and Evolve is ESS's competitor. It's a business decision... they either don't want to tune for them because they pay someone else to do their tuning and they can't tune for them in house; or they can tune for them but don't want to support their competitor's product.
ESS is correct about the O2 sensor location. It just requires additional tuning. The power gains are very real.
Another option is the CPI stepped headers, which have given me great results.
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I have euro headers with US spipe that have the cats emptied and stock xpipe and rogue el diablo mufflers.
Do you think i can gain power by replacing the S pipe, xpipe and muffler to a 3 inch setup up from 2.25 stock even with euro headers ?