Well, if you're leaving out the cat then you're removing restrictions from your exhaust system, so you may pick up a few horsepower. Overall though, it's just a noise-maker. I wouldn't really recommend it for an Accord. Accords are the bigger, slightly more luxurious brother of the Civic/Integra. I'd recommend you save up some cash and purchase a nice, subtle sounding after-market exhaust system. Something like the Apex'i WS. Or, you could have an exhaust shop build you something with slightly larger than stock piping, but I would still recommend using a resonator and an oval-shaped muffler. That should give you a nice sound...