The rivets are for aesthetics only. They both seal the same.
Nothings set in stone with me. I dont own a business...Just lemme know what you want and I will build it.
No. I dont see a need for headers at any of our power levels. The wheels are turning on a few ideas that have not been done tho. Im gonna do some testing first.
I have a 4'' maf pipe that clears the original IAC available. This means you dont have to spend $100 extra to buy an adapter for the IAC.
I have a 3'' uppipe and PTE upper and it clears, so keep in mind that this pipe may fit stock upper with stock pipe, but may not fit with 3'' uppipe and stock upper.