You might wanna hold out for the Greddy E-Manage to come out (it debuted at SEMA this year). Apparently, it is more versatile than a S-AFC (even allows you to run ANY MAF sensor), plus it has add on electronics available. I posted something last month about it. Try searching under my name and "solution 99 maf owners," or something along those lines.
Hehe, or you could just search under Greddy e-manage