Stock Cat Mod

Originally Posted by Super Werty

Heads---->stock exhaust manifolds--->AFR sensors--->cats---->rear 02 sensors---->muffler

so removing part of the cat will throw a code because the rear 02 will think the cat is damaged

Not sure how you are going to remove just part of the cat either without tearing the whole thing up...and for little to zero gain. Just get test pipes and a tune