When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
if im not mistaken the general theory is for every 1 psi you can expect 10rwhp. so say a powerpipe gives you 2-3 more psi your looking at another 20-30rwhp gain. not bad for $200+a retune if you ask me.
The powerpipe should not need a retune if you have a good tune. MPH said I will not even need a retune after the i/c and powerpipe... just adding timing to each RPM stage via the xcal 2