I'm curious as to why you thought the tech at Warnock was amazing? I thought he was the worst and will never go there again. Why not try to install the Corsa yourself? It's fairly simple and there's a HOW TO document on this website. Then take it to someone to have them weld the high flow cats on. That's what I did. Chris Barone of Chris's Collions did mine (shark toothed Viper in many Viper Mag pictures).
Chris' Collision - NJ - (973) 736-0465
Regards,
brett