Anybody from SoCal have tried hooking up a magnaflow intermediate catalytic pipe with RB's pre-silencer? Just wondering, car runs great but stinks with no cat at all.

 

Presilencer AND a cat. Haven't seen it done, but does sound interesting.

I'm running a REVII exhaust, but ecently swapped out the presilencer for the cat for a smog check. It is louder with the cat substituted in for the RB presilencer. It does seem that the run of a RB downpipe is long enough that a bit smaller main cat could be modified into it. Best of both worlds for street driving considering the California smog ****'s just keep up-ing their game.

 

i use the smb resonated metallic substrate cat and it works really well. Doesn't smell as bad as before and very quiet until you get on the throttle.

 

I run a generic 3 inch high flow Magnaflow cat in place of the presilencer in RB's REV II system, and it is way too quiet for my taste. Even under WOT I hear the engine noise over the exhaust.