just had high flow cats and mufflers installed on my f150, now a week later im getting a raspy sound out of the right muffler... inspected the welds and pipes and connections everywhere... there are no leaks. any ideas?

 

Could you elaborate on your truck and setup?

 

2001 5.4 4x4 with K&n FIPK system,duals with 2 magnaflow high flow cats Mag#94306 and 2 4 round magnaflow mufflers. 14in long maggie #10416. thats pretty much the only intake and exhaust upgrades....