bhr midpipe with cat or without?

Im not too sure but the cat will quiet it a bit. Really it depends on your current exhaust setup. As an example: i removed my muffler and am now looking into getting a midpipe. Im planning on getting the RacingBeat dual resonated for 3 reasons:

1. Its resonated so it wont be as loud as some other midpipes.
2. No rasp like other midpipes.
3. No catalyst so there is still a power increase.
   BONUS- it shoots flames!!

The catalyst on aftermarket midpipes usually only last 5-20k miles on the RX8 because they cant handle the high temps of the rotary engine.