Originally Posted by 90CvcDX
alot of additives are bad for engine parts and the extra components attached to it... i dont see seafoam being an exception.
Fuck it then, I'm not killing my cat. I've been down that road before when I used to be a dumbass and used race fuel. Come smog day it failed horribly w/no mods. I played dumb and the dealer gave me a new cat, but shit if not it would have been a grand for a factory cat.