Resonator or X-pipe??

[dirtboy]

I've got a 2002 330Ci with Technik Gen.2 headers, SuperSprint race cat mid section, and Eisenmann Race exhaust. Which would be better to quiet down the backfire sound (when decelerating and off the gas), a resonator or x-pipe? I'm going more for performance than sound.

I was thinking about adding this to the setup:



http://www.magnaflow.com/02product/s...ne=main&id=854

It would be easier to add the x-pipe after the cats rather than before the cats, but would it hurt performance?