1 more exhaust thread by mattftmfw

[Vegas_Matt]

Hai guies! I'm running pig rich and clogging my high flow cat which is a problem... So i'm gonna just take this opportunity and do it right by ordering a set of headers. but i have e-scan emissions so my question is this: Has anyone here used a magnaflow cat or any other cat and had no problem passing emissions? gotta fix it right this time. thanks.

[Silver GTP]

I welded a 3" magnaflow cat into my headers when I installed them and got a catalyst efficiency code about 6 weeks after install. Had to tune it out to make sure I can get through emissions here.

[matt5112]

do you have a tail pipe test?

if so look into the magnaflow 99000HM series cats. they're some big up cats that will guarantee a pass.

[Vegas_Matt]

bump! any 01+ guys out there with an aftermarket cat NOT throwing a code???

[Ricky21]

I drive an 02 and have no cat and hasnt thrown a code yet? everyone says it will so guess I will see lol

[Vegas_Matt]

how long have you gone no cat? how is your airfuel ratio?

[01gpgt01]

Matt with headers and a Highflow your probobly gonna have to do the plug fouler to not set the code