Basically its a DIY version of a real manifold. Weld a flange onto the stock cast header. Its not an exact science- its hard to weld anything to cast iron because of the different cooling rates but it can be done, u may need to re-weld a crack or 2 but it can work. Some of the first turboed hondas used this method . There may be more detail on a DIY turbo or HOMEMADE TURBO (at if i remember correctly). Oh yeah forgot to mention I dont think the precat would work unless you move your first O2 downstream. Alot of time n a lil bit of money can turbo any engine that makes exhaust gases. I think its less hassle to drop a 1.4t in for the ease of tuning and emission concerns (I HATE OBDII)