Skip White was selling a tip that looked like the Corsa's. They look pretty good and I actually ending up using them on my custom Gen 1 side exhaust. In my opinion the Corsa's look a lot more aggressive. I actually have a pair of 3" id 4" od Corsas that I tried to make work - but was unable. The attached pic shows the difference between the Corsa (left - 3") and the skip white tip (right 2.5" id).
Let me know if you're interested in the 3" Corsa Tips and I can try to figure out how much I paid for them. They probably should be welded on.