I have the Vortex, although I have a full exhaust setup. Sound is nice, pretty beastly. Doesn't have the high pitched whine of a Honda. Does get a little fart sound when it hits the rev limiter when I'm reving the car though, but that's only because of the rev limiter. Sounds really good and loud while driving. Now then again, I have my muffler where my resonator was, so it'll sound a lot different if you put it towards the end of the car.
No car anymore ;\ (taking a break from driving due to several misfortunate occurances)
Newest mod for my Dad's Cobra 'vert: My beautiful girlfriend and I for passengers when we want to go somewhere