Well since its a Hf put a d16a6 or z6,y8 motor in it. The Hf is made for gas mileage not performance. It is the lightest model though. You can do a about anything to the suspension and make it a really fun tossable car. Anything you can think of suspension wise you can out on these cars. But modifing that motor is a waste of time, it will take you hundreds maybe more just to equal the Hp level of the Si stock motor.