Amini9

I think its interstate brand? what do you have?

TLDriver

iTrader: (4)

LOL I just noticed you are in CA. Just go to a muffler shop with a tub of KY. From what I have heard CA now requires all cats' to be OBD2 and need to be CARB stamped for it to pass smog. With that said... they charge us up the you know where for new cat's. If a shop gets caught by hollowing them out will get a nice slap in the hand.

Jfg kevin

i have the same problem....I've research it...and it might be what they call a "lazy o2 sensor"...or it can be bad cats..

My question is...if we switch to a high flo or a straight pipe...I have a 96 and if i'm not mistaken it's a obd2 car...Will the car pull a CEL...??

QwkSC

iTrader: (1)

A CEL will be caused by
1. Bad O2 sensor
2. No Cats
3. Hollow Cats

High flow cats will not throw a code because they still function properly, just like OEM cats. Of you want to hollow out or put in a test pipe without a CEL then buy an O2 Sim

UZZ30-SC4

If its from the engine bay its most probably not the cats, unless you have an exhaust leak. First correct suggestion would be your battery, look for signs of acid leaking from it. Second a bad cat wont pop, popping shows it functioning, specifically pertaining to whats called a type III cat like our vehicles carry. Also, check for oil leaking, depending on the type of oil you use, it can smell pretty funky when it gets burned off by the header.

1JZPWRD

iTrader: (59)

Check your battery.. Your alternator may be over charging your battery.. If not that, then its your cats.

Ali SC3

iTrader: (10)

check to see if your PCV and crank case hoses have not fallen apart or cracked. the pcv valve itself can also get cracked. anytime you get on the throttle it will smell kinda funky like a muscle car. I know its not really like sulfer, but its an easy check.