I attempted this mod but couldn't find an extension that fit down the bent pipe. So I spent $10 & got a pack of cut off wheels & a 1" hole saw. I did the partial gut I think, cutting the little pipes about 1" back. I didn't take the exhaust off or any of the trim. It sounds awesome!! Nice & throaty, no backfires or rattles. IMO it sounds like vid clips of the 2 brothers. I tried using my phone to record but it distorts the hell out of it.