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Yeah, taking off the CAT increases a lot of power, but it also takes away your gas milage. The CAT wouldn't really mess anything up since it's all exhaust anyways. It's just to keep the exhaust gases cleaner. To pass smog you're going to have to have that CAT on there though. If you live in the US, I'd suggest getting a high-flow CAT.

Taking off the muffler also does the same thing, just not as much power. It's also very loud. If you do deside on taking off the muffler, rig up a pipe that goes curves downward so you don't burn up anything. My friend took off his muffler and ended up burning off some odd axle boot. Exhaust gases are extrememly hot.
 
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