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You can go to a muffler shop and they will cut them off, maybe, as it is illegal to take off cars that have factory cats. Then they would weld an piece of pipe. But if you have factory cats, good luck in getting a shop to cut them off. or unbolt them in some cases. Your better off buying new headers and a new exhaust without cats, not for street use. According to where you live, you might no need a pollution inspection. Here in Mass any car over 25 years old is exempt for pollution inspection but no safety.

 

You'd have to get O2 sims so the ECU wouldn't keep going into Speed Density mode, if your car is OBDII... I think. Are O2 sims even available?

It shouldn't be louder. The cats are before the mufflers and their purpose isn't to keep the car quiet.

What kind of performance gain are you looking for? You could maybe measure a gain on a clock, but you won't be able to feel anything. You're looking at probably a few hundreths of a second in a quarter mile. Less than a tenth, I'm sure.

 

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If you're just interested in a deeper sound, you just need a muffler replacement. I don't know what muffler to recommend, though. If you had a Chevy it would be different.

Depending on the shape of the exhaust, you can bypass the muffler with a pipe about half the diameter of the existing exhaust pipe. It makes for great sound. For example, it takes a piece of pipe less than 6" long to bypass the mufflers on a late-model Camaro Z28 or SS. This is essentially a poor man's Borla for a Camaro, which bypasses the mufflers using different plates with different sized holes in them to "customize" the sound. I wouldn't do it if it takes a pipe of any length longer than about 6".

 

Go to a muffler shop and have them remove the baffles from inside the muffler, you get a nice roar. They will cut the muffler in half cout on most if not all the baffles and weld in a straight pipe, and then wheld the muffler back together. Had this done once on a 86 Porsche I had, sounded mean.

 

Can't you buy one for cheaper?