You'd be better off trading your car in, taking the loss, and buying an ST.
While it's not a completely different engine, as the engine in the ST is based on the same architecture as the n/a 2.0, many other components are different. Pistons, crank, rods, intake, exhaust, cooling system, ECU, etc.
It wouldn't be worth it, and that's if it could even be done without doing a complete engine swap.
Joined the dark side.