you did your hw eh? does that include me lol
anyways, if you are boring out the engine keep in mind you will have to be buying new pistons etc, probably a new headgasket, new valves to handle boost, new fuel system, engine management, etc etc... it adds up way too fast
personally I would bore it to 3.0l with a high comp. ratio, spend whatever money you have left with suspension mods and reinforcing the engine and an aem ems (if they work for bmw)... then when you make more money just change out the headgasket and drop the turbo in there... that way it will be safe, reliable, you will actually be able to get the hp to the ground and it will be a complete car instead of a half-ass cut corners job...
but I like the idea of a 1990 400hp bmw
