engine swap defitely. swap in a b16 or if money isnt a prob go for the b18c1. if your gonna do alot of work to the stock motor it might not be worth it. their are turbo kits for the d series motor but their like 1200. a b16 is about the same at http://www.total-boost.com/?id=15563. they can handle all ur guestions and are really knowledgeable i got a h22a with 5speed tranny for only $1900. motor was in great condition. excelent service. the b16 starts off with 160hp. im not sure about the d series guessing around 115hp since my old sohc accord motor was 130hp but was 2.2liter and without major mods to ur stock motor it wont hold alot of boost so maybe a gain of 40hp so ur at what a b16 starts off with