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One of the advantages of the cat-back option is that there is no butchering required. The middle section and backbox are all in one piece on the 172 exhuast, so for a backbox-only theres gotta be some cutting.
i have a piper x induction kit on mine and it sounds better than my mates who has a K&N think his melted once!!just got a mongoose full system on now and it sounds awesome i have a de-cat on mine and it gives me more power all through the rev range +it burbbles when i gear down and when i tap the accelertor over 4500 i can get loud bangs and small flames out of the exhaust cool hey?