pacesetter headers = bad craftsmanship
I will say the painted ones are of a less quality..then again like it's been mentioned look what you were wanting to spend..you get what you pay for.
i just mocked one up to check fit with my clamps and what i did was take a sheet of 26ga aliminum that i have..i cut 2 pieces by 2"x8" i would say and bent it around the outside of my collector then put the clamp on and got it going/forming.Once i got to a certain point i slid my bullet ins which was half the size of my 3" dual bolt clamps and finshed torquing down the system..i couldnt pull the muffler of when i tried so it made for a good fit now.hope this helps some one with the same problem
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maybe you got pace-setter knockoffs. my 2 sets and the 4 others i helped install never looked close to as bad as you are describing but then again they were all coated ones.






