When I first bougth my 03 Cobra, I still had my supercharged 1995 Mustang GTS. I had GT-40Y heads, Cobra intake, Steeda #19 cam, full exhaust, and all the little bolt-ons. To top it off, I had a Powerdyne XB-1 (similar to S-trim performance) set-up for 11lbs of boost though with the powerpipe I was seeing 12-13lbs depending on the weather. Never got to the track with it but it dynoed 470/420 rwhp/rwtq SAE. The car weighed about 3200#'s and would easily pull on my almost stock 03 Cobra (raced the wife a time or two) with nothing but a cai and catback. I still believe it would pull on the top end even as my Cobra sits right now. It didn't have the low end but above 4000rpm, it pulled like a freight train. The hp curve simply outclimbed my Cobra's. Not sure what heads you're running but I will put my money on your car, at least on the top end. He might own you in the 1/8th but after that, if driven properly, you should take him.