Originally posted by MrFatBooty
You can "gut" the cat basically by taking it off and banging it on the ground until the assorted stuff inside falls out. Voila, now you have a straight pipe. Of course, this is not emissions legal but it'll probably get the car running smoothly again. I would recommend you get high flow cat. A Carsound high flow cat can be had for probably 100 bucks or less and then you just need a muffler shop to weld on the proper flanges to bolt it in place of your stock one. Otherwise, Landspeed Racing sells direct-fit high flow cats for $230.
It's basically just a part of the exhaust !! I think I'll keep it street legal & go for the landspeed...THANKS!