red02s2k

just go gutted its free and easy and if you need another one just go to the junkyard and pick one there only like 80$$

Russ

Gutting the cat will not provide the same benefits as a test pipe because I don't think a cat is a straight-through design. You are creating a resonator chamber by gutting it wouldn't you not?
You WILL get a benefit though with the test pipe. As Bullet1123 has pointed out (I was there), he got at least 6-7hp but for my ears anyway, it was just too darn loud for
city driving. A test pipe on an already aggressive exhaust will have cops running
out of donut shops to find you.

Gernby

I should have mentioned that I borrowed a J's single exhaust for a couple months, and it was FREAKIN' LOUD! It was WAY louder than it was on the S2000 that it came off of.

I don't recommend gutting the cat. I did that to a previous car of mine, and it sounded like crap. I also don't think it gained any power. A test pipe should be the same diameter all the way through. A gutted cat will cause the exhaust gasses to slow down then speed up as it flows through the empty chamber.

jakub2000

A test pipe on an already aggressive exhaust will have cops running
out of donut shops to find you
The best joke I've ever came across on s2ki:O))))))))))

smccurry

I agree. I have the J's N1 exhaust and it was already loud. After putting on the test pipe, it got a lot louder.
Be prepared for very smelly exhaust and the complaints from any friends that will follow you with their windows open (or a/c set on fresh).