blkchevyz

what size is it and the cat? are they 2.5? or are they a little smaller or bigger?

getting ready to put my 3 inch exhaust on and i have a couple 2.5 inch high flow cats that i have left over from my camaro. was thinking about cutting the stock downpipe infront of the cat and replacing it with one.

blkchevyz

just looking at pictures of it from the header swap thread it looks like its bigger till after the u bend then shrinks down.

severancej

It's slightly bigger than 2.5. I bought 2 of a 2.5" test pipe 18" long at auto zone and made them work because their ends open up a bit. I deleted my cat, u bend and o2. And reused the stock rear flange, it was actually easy just took me some time..

blkchevyz

i'm trying to keep emissions on mine.

with the size difference is it slightly like its using 2.5 inner diameter vs outer? or more like 2.75?

also its stainless correct?

severancej

No it's not stainless, it was rusty, actually I'm not really sure...

Honestly i think it's 2.75 o.d. Maybe a little less.