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 This is how it looked before anything was done to it This is the flange that was cut off so it can band clamp directly to a collector. This is the other end that has the 2.5 Adapter welded into it.