I had the very end of the prochamber ( the end that flares out ) cut off so that it can band clamp directly to the collectors. Also had the section of the other end cut off and an adapter welded on that will accept a 2.5 Catback system. The over all length of the system is the same as it was stock, the 2.5" adapter can be cut off and a section of 3" welded in if you wanted the whole thing to be 3". $265.00 + Shipping costs