just run a stock ls motor, 20psi on a t04b and a 50 shot.. look in the feburary edition of sport compact car and check out the red hatch my friend has. (the article is 8mo old) but more recently the car has run 12.0 on street tires.

at least with that kind of setup you have some stout power on the street and that extra bit of power when you need it.. unlike a pure n2o setup