hey guys i have the stage 3 exhaust done on my car and i know the stage 3 mod doesnt include removing the cat...but i was wondering if anyone is running the stage 3 mod without the cat and if so are there any sound or performance differences?

 

The sound won't have any different, on performance you could feel little bit faster(more flow).

 

actually, I'm sure sound might increase a slight bit.....you are removing basically a wall of crap in the way.....

 

I have mine cats out but I didn't notice and different on the sound.

 

hmm....I figured it would have. I know I read someone that said with the 3rd cat delete it got a bit louder.....

 

hmm well i figure common sense would tell us that by removing the cat that performance and the loudness of the exhaust would both go up even if its very little, i just wanted to see if anyone tried it and noticed it

 

is the 3rd cat REALLY needed to pass emissions??

 

nope. There are no O2 sensors after that 3rd cat. It will pass without it since it wont throw a code.

 

Haha I never posted this because I figure people would just flame me anyways about emmissions and what not. I was doing my oil change about 3 weeks ago and I was looking at the 3rd cat... Hmm.... no O2 sensors so it probably wont throw a code.... Bolts before and after so no welding...... Yup, I unbolted it down, busted out the insides and put it back up. I honestly cant tell a difference either way. I figure that it would be more beneficial to those running superchargers. But I am probably throwing a charger on when I get back from Iraq..

 

There no O2 sensors on the 3rd cats and I took it off for more than 15kmiles on it check engine light didnt turn on at all.

 

Right, I was more making a statement than asking. But that is good to know that no codes in the long run, Thanks.