I have a cat that I used for the stock down pipe.I now have a THDP and ordered a cutout with it,does anybody know the lenght of that cutout so I can get my 2 1/2 cat made to fit my new setup.
My TH dump pipe is 12.5" flange to slip joint end. My cat is 12 and 5/8th's total. Please keep in mind that with a THDP the connection at the pipe is a slip fit so it can move in and out a little, no clamp. Hope this helps you out, Phil.