4.56s on the steet ?

If your car has a 4 speed now, don't shift out of second gear. If you have an automatic, leave it in first. Drive to school that way for a few days. No third or fourth on a 4 speed, no 2nd and third on an automatic. Try driving 55-60 miles per hour in first or second for an extended period of time. That's what 456's will feel like in drive or 4th gear.

Your 4 speed will have two gears BELOW second and your automatic will have two gears BELOW first, so you have blinding accelateration (to 50 mph) and you'll be able to pull stumps out of fields, but first or second now is what your drive gear will feel like. (with gas mileage to boot). You'll be able to pull out in 4th or drive but you'll have nothing above that to shift to. 456's are quarter mile drag gears..nothing more.