What is the preferred size for a straight pipe 6.4 Powerstroke Straight Pipe
. Can a 2003 6.0 powerstroke be straight piped without a tuner? Profile photo of Dylan. Dylan Hiatt ▻ 6.0 Powerstroke Marketplace. 1y Tuned & Deleted 6.4 Powerstroke on 24x12 American Forces! -7c cold start. 4” straight pipe 6.4 diesel. 6.4 powerstroke 5 inch turbo back exhaust and 4 inch downpipe from Performance Racing . Can you straight pipe a 6.4 without a turner? Ford 6.4L PowerStroke Discussion Forum. Blake Whightsil ; . Will a 5 inch straight pipe require ...