[guilty]

I have a Ractive tip I got from a local muffler shop, ovalular and it fits perfectly in the shape of the exhaust cutout. You should head to a muffler shop that has some tips on display and check some out.. if they're cool, they'll let you do a test fit (slip it over the tailpipe) so you can see what it'll look like on the car.

It's personal preference whether you want a tip with a rolled edge or cut edge, circle or oval.. Just dont go too big and dont have it sticking out too far and you'll be good. Also it's a good idea to get the shop to weld it on and cut a bit of the stock pipe off, then you'll never worry about the set-screws letting go and losing it.