Just remember, HP gets you speed, torque gets you acceleration. You might have enough HP, about 600 or so, to go 200 MPH. But, these cars are not designed for that kind of speed. High torque will get you great acceleration. But, these cars are very light and anything above about 250 ft-lbs will just make your tires smoke more. With a near stock, 300 HP, 300 ft-lb engine, you can get less than 4 sec. 0-60 times and near 150 MPH. Engineering calculations indicate about 55-60 HP for 100 MPH. So, from a performance standpoint, a stock engine is really all these light cars need for maximum, safe performance. The high HP, blowers, near race engines are all personal preferences. The fact is, unless you are willing to take some very big risks, you will not ever use more than about 100 HP. If you have a sturdy frame, 2x3x 3/16 tube, you should be fine.