Quote Originally Posted by taxfree4 View Post
How were they designed, to do what purpose? If it wasn't to eliminate the drone - they do, if it wasn't to eliminate the cats - they do whether you have stock exhaust or after market. If these weren't the intent of the build then what was?
I have them with my cobra 626 exhaust. IMO, I think they were designed to add a slight backpressure to some of the aftermarket exhaust systems, but the stock exhaust already has restrictions so if you add loopz, it might have negative results.