Will it throw any codes or run like crap? I figure its an easy way to help it run a little better.

 

it'll throw a code but won't run any different. it's an easy fix with an o2 simulator as well.

 

^
|
....or tuning

 

It sounds better, throttle response is better just gooseing it and WOT, revs better. Does smell a tad like fuel though. Runs better in my opinion. cats suck, lol. I was complaining in another post about it not being able to even chirp the tires at take off. Now it spins some.... The cat must have been clogged a little.

 

To really take advantage of the !cat mod you should have the car tuned. You can lean out the fuel mixture a bit more without risking killing the cat, and that will allow you to make more power....

- Justin