I have done alot of searching and I have no idea what type of CAT i sould buy. I have a 86 s4 it is my daily driver and i just wanted to keep it emissions legal. right now i have 1200miles on the rebuilt engine and it gets good gas mileage. I have been looking at products from rotaty performance and Mazdatrix. I was just wondering what kind or type of Cat would get rid of the common rich smell and wont rob me of a ton of power

 

Get a hi-flo catback. Check out www.mazdatrix.com (the racing section). I beleive RX7.com has the bones hi-flo cat

Jason NYC

 

Thanks man I was actually thinking about buying the RB Header and the Converter that comes with it. I was wanting to know would a medal core converter last longer on the 13b. I heard that they are louder but if they last forever i can get a sliencer to handle the sound.

 

Aren't they already metal core or somthing just to survive at all?
So which cat are you getting, the Bonez one? Those are generall good cats from what I've heard.

 

I don't think the Bonez are metal substrate, but no matter what cat you get it will die eventually.

 

I bought a used Bonez hi-flow cat *used only to pass smog twice by previous owner* to go with my Racing Beat header. I passed California emissions with that setup. The guy was cool and didn't care about visual, as long as you had a cat fed by an air pump and passed the sniffer you are good to go. I passed no problem though.