There is an aftermarket supercharger that retro fits on the 2.0 liter engine. I do not recall what HP gains are possible..
With the 2.0, I would be very hesitant to boost this engine much at all as this is a normally built engine that is not over built to handle the increase in stress to the head, valves and pistons with connecting rods and crank bearings..
Procede with caution... JK
well i was saving for an aftermarket kit that cost like 2000 but then i realized i was only half way there and i'd have to pay to get it put in too. so i started spending the money. bought a hood though