Very good manifolds, fit great! Pros + Synchronized header pipes, larger diameter pipes, Cons - EGR pipe not perfect > EGR pipe adjustment, depending on your exhaust flange, mine was a bit wide for the header bolts. she just had to wear it. made them work fine. Finale: helps the engine breathe! Sounds good! would buy again! 2001 Crew-Cab F150 5.4L 8-digit L