I recently purchased a stainless steel MVRP cat test pipe for my '03 6.0l. What are you guys using between the flared end down pipe and the cat test pipe flat face flange. I'm thinking perhaps a 3-1/2" donut gasket? Thanks!

Steve

 

Found the problem. MBRP sold me a cat test pipe for one of their exhaust system tubro down pipe and not the cat test pipe for the stock pipe. Too late to return as it is now installed. Now I have to purchase a turbo down pipe to get the correct mating flange, something I'm not going to do at this time due to low funds. I'll have to come up with something.

 

Just wire in a o2 eliminator, make sure the electronic eliminator Is going to satisfy the ecm then take your cat off gut it, put it back on and your v-10 can breathe alot better and get some of that exhaust heat out of the motor, it will run better as long as you don't throw a OBD2 CODE. I did that exact thing to my 7.4 roller with banks headers. Thing was a beast!!

 

Wrong forum, and a 14 year old thread!