evo4life94

My cat has gone bad(stock cat) and I know this because it smells like rotten eggs lol I have a test pipe already but not sure if i can safely drive with it on. I have searched for this answer but only threads of evo X's come up and im not sure if it will be the same for evo 8's?

Well my question is, can I run a test pipe on stock tune? This is with a WORKS drop in filter and Buschur magnaflow catback. I know i should get a tune because of going lean and overboost problems but i wont be able to tune until a month or 2. I am waiting until I get a downpipe, MBC, and fuel pump.

Will I be ok driving a month or 2 with a test pipe, catback, drop in filter with NO tune? Or will i be better off driving with a bad cat?

jmcmill3

iTrader: (17)

put the test pipe on .. its not gonna mess ur car up, just be sure to get the antifouler/spacer for the O2 sensor

evo4life94

Alright cool, ill be putting it on right away
Another question though, can I still boost or do I have to completely stay out of boost until the tune?

jmcmill3

iTrader: (17)

lol man you will be ok, i drove my car on a test pipe and no tune for 60k miles. it changes things but not that drastic

evo4life94

Haha alright man was just a little scared of the stories about running to lean and motors blowing lol or is that just with a downpipe?

Just installed it and car definitely sounds better! doesn't even smell that bad like everyone says, I was scared of smell lol

evo4life94

Yes, antifoulers were installed as well

89Saleen141

Hey i'm about to put in a test pipe as well. I never heard anything about this antifouler. Can someone fill me in?

evo4life94

Here you go man,

https://www.evolutionm.net/forums/ev...cel-light.html

fastyouth1313

iTrader: (32)

An antifouler backs your rear o2 sensors out of the direct flow of exhaust gases. The rear o2 sensor is for emission purposes and it also makes sure your CAT is doing its job.

With the anti fouler installed it won't read all the exhaust gas that a test pipe lets through there for it won't trigger the CEL light for a bad catalytic converter.

Hope that helped

89Saleen141

Thanks for the link and info guys.