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.
I'm installing a 4" SS turbo-back exhaust from Hog Performance on my '02 F250 PSD. The muffler has fluted slots in it, the majority of these face in one direction. Can anyone tell me which direction the open holes in these flutes should face?