plenty of people turbo that engine, but aside from that it gets almost no love. you COULD get some type S pistons, an H22 head, some cams and youd have a kick ass engine (itll probably be between 1000 and 1500 dollars worth of work). You might even be able to keep your old head and have it PnPed, but im not sure how much power youll make with that h23 head.