Originally Posted by JCD911S

White Rock- looking at your setup listed in your sig, I would keep the mufflers and ditch the 200 cell x-pipe. I recently installed the catless x-pipe and it just amplified the exhaust sound, which I think is what everyone is after- a slightly louder tone, yet I was still able to retain the same exhaust note. Keeping the muffler and just removing the cats allow you to still have a refined exhaust tone, instead of the raw drone sound of a complete muffler bypass.

I know there's been concern about loss of torque when doing a cat bypass, but I think the same will happen with a muffler bypass since both scenarios reduce back pressure. Plus, the torque loss wasn't that dramatic, especially with the cross-flow design of Fabspeed's x-pipe which helps maintain a bit of that back pressure. Good thing is there's a hp and tq gain in the higher RPM's.


If you're worried about emissions, the 200 cell cats aren't street legal either (at least in California), so the fine for running non-compliant cats vs. no cats at all would be the same.