trying to make money off the m42 crowd with such a big-ticket item is a mistake, IMO.
as has been already said, most of these kids are scraping together cash just to keep the car running.
in a different situation i -might- buy at a $2000 price point, but i've already pieced together manifold, turbo, wastegate, etc already.
if you want to make money, design and produce a good M42 turbo manifold for less than 666fab does, sell that, and let people do the rest for themselves.
but be warned, otis (good & tight) tried that angle with a run of 10 manifolds and ended up pretty frustrated by the experience of having a bunch of people saying "yeah i want one!" and then when he had them ready to sell everyone disappeared.
i managed to benefit from that when he wanted to dump stock- got a ceramic-coated M42 turbo manifold for $400 because he just wanted them gone.
believe me, i've thought about how to produce parts to release to this crowd as well, but every transaction i've gone through with an e30/m42 owner lately has made me think there are better ways to invest my money.