It's 3" all the way back so you will have to tighten it very well at the junction with the stock pipe.
Would also make for a cheap TBE if you get the ERZ / SRS downpipe and what not. It did rattle against the bottom of my wagon some (floorboard) but I'm thinking kartboy long hangers would fix this or just having the whole TBE and not just the catback (I bought only this catback section from a full TBE).


