Was wondering if anyone knows if the japspeed down pipe is the same size as any other downpipe make? Only ask as I was considering trying a different cat back system matted to the downpipe. Will phone japspeed tomo but thought I'd throw the question up here first

 

All you have to check is diameter. MOST aftermarket exhausts are 3" diameter but tapper to 2.5" at the downpipe and MOST downpipes are 3" at the top and 2.5" at the bottom . . if this all matches 99% of the flange patterns are the same

 

Sorry, I ment the actual length of the pipe. I know it's a 3" but wondered if I could mix n match the system, if that makes sense.