Just to put things in perspective and i hate to tell it but hopefully no one from where i live see's this but i have a bolt on 2004 mach 1 motor in my 2004 convertible 5spd gt. The ecu from the car the motor came out of was tuned. It has pullies, k&n short ram intake, full exhaust, and i had a set of 4.30's installed. My heavy car on 17x10.5 deep dish bullitts and 315 street tires launching at only 2,000rpm's ran a 12.71 at 108mph. It bogged in 4th also so it actually may have been good for a high 12.60 pass. Its highest trap is 109mph to date. That should tell you how much potential a mach 1 motor has with only small bolt ons. my 60ft was a 1.87. If i get it down to a 1.6 thats low 12's all day in a convertible. im looking to do cams next. Also a mach is a great route to in a few aspects over the cobra especially if you have a budget. One thing is the insurance. The cobras insurance will be much higher as the mach 1 doesnt exist in the insurance world. I say go with the mach 1. As someone stated before on how a 450rwhp cobra doesnt want any parts of a 450rwhp mach 1. Thats true. Hp for Hp its hard to beat a mach