[eschaider]

Small bore sizes will cost you valve curtain area because of reduced valve sizes, which will cost you pumping losses that translate into torque losses. Stay in the middle of the sandbox, and you will be happy. Go to the extremes and you will not.

Compression braking in a Cobra, in anything but a straight line, is a good way to swap ends in a New York minute. Don't build or do weird $hit. You will enjoy your car more and longer, spend less money and crash it less.