geartech

3.2l Carrera. Any one used the OBX cat-bypass pipe on one of these.
Most of the ones I've seen have a resonator in place of the cat. The obx has a pipe that looks like a resonator. Just curious about the sound level with out the cat and just the muffler?

UberXY

I had one on an 85 ROW car. Didn't really sound much different, if at all. Had to replace it with a cat as I then lived in an area that had rolling dyno emissions testing, and with the cat bypass it failed miserably. New cat made for awesome numbers, no noticeable change in performance.

rusnak

I agree. No big change in sound or performance unless you are really on the gas. It's cheaper and won't wear out if the O2 sensor or dizzy goes kaput though.