I cut out the CAT for HP gain and it works, use a dermal tool with lots of those brown disk they cut better than any other disc
CAT cut out, make sure you cut along the weld line
This is what the CAT looks like and I dermal out the cone on the inside and welded the cover back on and also the bung for the 02 sensor.
CAT gone and hole drilled out for the O2 sensor bung
along with the OEM exhaust mod I also mod the OEM airbox with a bunch of 1" air filters
I also did the muffler mod and it was to loud for my taste so I took it off and went back to my stock muffler, there is a video on modding the stock muffler, CLICK in PIC and my Video will start
Youtube video on how to shorten or make your stock muffler noisy to attract the cops
[ame]http://www.youtube.com/watch?v=kdWQPfV8CZQ[/ame]