I have a 4BT in my ranger with a 16cm housing on its H1C. I was wondering if there's any place I could trade it off for like a 12cm. I've also seen people block off one of the veins in the housing to lower the effective area. Thanks.

 

Everything I've heard is that the exhaust housing from the WH1C and HX35's are interchangeable, but you may want to wait for a confirmation before you go buy one.