does anyone know the stock size from the downpipe is? also the ultimate racing exhaust flange size that would bolt on the cat? i am thinking of making my own test pipe and just need to know the sizes. thanks in advance!

 

the UR stuff bolts to factory dp or cat locations. the flanges just have bigger holes.

stock downpipe is around 2" i think.

 

why not just get a test-pipe gasket kit from a vendor, which you'll need anyway, and use that as the basis for your flange design

 

Good call!!

 

well im not making the flanges myself... napa sells the flanges that you would then weld to piping, but they have many sizes of 2 inch flanges and 3 inch flanges .... i just wanted to know if someone knew the exact size of the downpipe outlet and the UR flange that connects to the stock cat

 

so why couldnt you just take the gasket down to napa and match it to a flange they have in stock?? the i/d of the piping is going to be 3", so just find a 3" i/d flange that matches the gasket shape and bolt alignment and you're set