Hey all, I have a Racing Beat header just lying around waiting to go on after I smog the car in April. After I SMOG and over the summer, I was thinking of upgrading the exhaust system from the engine back to the y-pipe (already have a cat-back). I was just wondering, could I hook the RB header up to a Bonez DP/cat? If so, what kind of custom work would be necessary? Also, how much HP do you think this would gain on an N/A S4 with nothing but S-AFCII, intake, and a cat-back exhaust?

 

Bump

Nevermind, basically answered my own question with a little bit of wasted free time. Basically I'll just run the RB header, a custom 2.5" connector pipe, and a carsound cat. That's seems pretty easy and a pretty cheap way to get about 5-8hp.

 

i have my rb header hooked up to a bonez high flow cat no problem

 

They bolt together without any custom piping in between?

 

Are you talking about the Bonez hi-flo converter system? I checked, the header would run into the DP. The RB runs down, eliminates the first pre-cat, and runs halfway into the next one, about 5" short of the main converter. The Bonez system is designed from exhaust manifold back. The RB header is longer than the stock exhaust manifold. How did you do this?

 

yah they hooked up to each other just fine as far as i can tell