It is a pain to install...but the choice is up to you. The SC is obviously more expensive but the power increase is always there as opposed to how long your bottle lasts...The lowest ET i've ever seen is 14.1 PhatSVT Ran it I think...that's for a supercharged contour. I think someone ran a 13.7 with a 100hp shot of nitrous, and it was a non SVT duratec too! The major problem is traction, not power. Again, these are not drag cars either. With 300+ hp at the crank, the tranny is inenough danger on street tires, strap on slicks and stuff WILL start to snap on you.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.