Cut outs...I would like to hear pros and cons.

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They may effect your ground clearance. When mounted behind the headers it puts in the middle of the car. They were on my 73 Challenger and they scraped on everything:eek:
Well.......I said that and I think about it and there is ONE way I think I might like them and NOBODY ever does it like this. If they were installed RIGHT at the header collector, they would probably sound badass. But people always install them further back and the sound from open headers gets lost somehow.