Originally Posted by sportster07

Then take it somewhere else. 99% of the general public won't know they came with 4 and even a lot of the OEM replacement systems replace the stock 4 with 2 cats anyways. The law doesn't say you need 4, it says you need to have them. I have two high flows and zero problems.

Originally Posted by Alxe

just do what's been said already in the thread:

Cut off the fat cats, leave the pre-cats and get some spark plug non foulers and your problem is fixed