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I have never had problems with Kooks either, but neither ARH.
ARH specifically says their collector design can make it a smidge tighter than the other guys, but the clearance is a non issue.
Mine are 1.75 though, so maybe that helped me.
I’m gonna throw LG in the hat. I’m running them and had zero fitment issues. Catted, super pro version and before my blower they were the best mod I’d ever done!