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.
01 gt just put hpipe on no cats mileage sucks now and feels alittle sluggish from before and obviously cel came on so do you need to tune when you put aftermarket hpipe or just shut off rear o2's?