Yeah, I got the stock exhaust... why would you wanna put a muffler on a Corolla?
If they are done right, they don't look or sound bad. If fact, if done right, they look good and sound good. The problem is that 95% of the wannabe street ricers, don't do it right.
I don't have plans to put any exhaust system on my car, but if I were going to do a cat-back, the magnaflow system looked pretty good. It has a resonator to fight that ricey droning sound, and was SS and because it's magnaflow, it should have a proper muffler that looks, fits, and sounds right.
Also, the TRD bolt on should work. I think it gets a 1HP gain claim.