Hey guys I searched, searched, and searched for two days now about this cat failure and got a little information but not the whole answer im looking for. Ok so I found out we have 4 cats...two pre cats on the headers and two actuall cats under the car...I want to avoid f***ing up my engine so I want your guys advice. Can someone take pics and point to the cats? I want to know exactly where they at...Also does replacing my headers with MSDS and putting straight pipes instead of the cats under the car fix all of my problems that i may encounter? I have almost 118k on my car thats why its worrying me so please anyone know any lil bit of info post your responses as it will be much appreciated. Thanks in advance.