Exhaust questions; Cat and O2

[gijoe985]

I've done some searching and found out parts of my questions. I've a 3" catback that came with my car. Without looking I am now assuming that there is an adapter on it for the cat.

I was looking at some "test pipes" on ebay. Or I have thought of making one. Something I have not yet been able to find a good answer to is, what happens to the rear O2 sensor if you eliminate the cat? Doesn't that throw the OBDII for a loop?


Also, what's the difference between a cat made for a 1g and a 2g? And Turbo vs NT? I keep finding stuff labeled for 1g and for NT cars. I've got a 2g GSX...

Thanks for the help!

 

[romeen]

http://www.dsmtuners.com/forums/newbie-forum/252860-running-no-cat-leave-o2-not.html

The foil method I describe in that thread actually lasts longer than a year. I wrapped mine 2 years ago and still no CEL.

 

[4g63Powered]

There are also companies that sell "o2 simulators" that allow you to not run a rear o2 sensor.

 

[gijoe985]

Is there much of a difference between a 1g cat and a 2g cat?

 

[fatherbubble]

RRE has a race pipe that will work for 60 bucks i think. Look on vfaq they got a way to hot wire your rear o2 so that the ecu thinks it working.