Hey, I have an 04 rx8 and heard a high flow catalyst will help it out a little. Is this true? And if it is any recommendations?

 

I will be nice ...

RP Supercat
Davesport Cat
HJS 100CPI cat

i will leave it up to you to research to see which one of those will actually work fine and not get destroyed after a couple thousand miles

 

Just get a straight pipe. To keep noise down get one that is resonated like the one from Racing Beat.

 

Where do you live and how much do you care about pollution?

 

^looks like San Jose Ca?

 

That was my guess as well, as far as I know about Cali, they hang people for going catless.

 

i went catless for 3 years, got pulled over 7 times and not once did the officer try to hassle me about it, i guess mine was pretty quiet mated up to the stock exhaust

 

I have an RP super cat I live in cali too. my exhaust is stock it sound stock besides my noise maker up front (AEM CAI) I think any of the options mentioned will be find, like dozer said with stock exhaust an dual resonators it's pretty quiet.

 

http://www.ebay.com/itm/HJS-Universa...b0f811&vxp=mtr

you will need to adapt it

 

Yah, I live in San Jose, Cali. I already passed smog, and got the car on new spring plus different exhaust. And I have a couple in my friends shop and they said I can take one, so I decided to ask around.

 

If you don't have some clue about what you're doing, don't do anything. There are no easy, cheap power gains to be had. Every answer to your question is already in the forum.