2.5" Inetermediate pipe used by Whisper 2.5" Catbacks. Can be used with MadDad, Stromung, H and S, Prodrive and serveral other 2.5" Axlebacks sections. We have confirmed fitment with the brands mentioned. If an axleback is designed to bolt on to the factory intermediate pipe this would be a suitable pipe, eliminating the packed facotry resonator and adding a slight volume and minor flow to your exhaust. Check with your axleback vendor before ordering if you are uncertain about fitment for your application. This pipe uses a donut gasket flange on the side that mates with your downpipe. Works great with the factory downppe, Cobb downpipes or others that use the factory style 2.5" donut gasket
