modify your throttle body? hahaha. coolant bypass, here's an idea, 1) if you live in a cold climate, don't bypass it, 2) it doesn't make squat of a difference, performance wise, on such small engines.
hmmm....turn the boost up 1psi and a FI engine will make more power than a coolant bypass kit or a phenolic spacer (plastic part that doesnt conduct heat).