ok everyone says they are awesome but i wanna know what kind actual power gains i am looking at. i am between a cam and a flywheel. maybe even both.

 

Its not the power that pwople like about the flywheel. Its how much faster you rev that people. with my crank pulley, MSD ignition,and aliminum flywheel, my D series revs almost like a sport bike

 

yeah i've got the act prolite on my car and its intense. gas mileage isn't an issue if you know how to drive and since its about 12 lbs less than stock, alot more torque gets to the wheels. I can do a pretty good peel out with my d15b

 

i used to have one in my rex before and its awesome! response alot quiker than the stock.