I don't want to talk down on him either... Planning all that stuff out and doing it must be very time consuming, documenting everything and putting it on the net makes it even more time consuming (and I know he's involved with Audis too). But in the end it works out better for the whole community because it saves other people from having to duplicate work that has already been done... It's hard to advance on to even newer mods if you get bogged down in trying to figure out ones that have already been done. And if you aren't a mech eng, it's frustrating, if you aren't an eng at all it might be impossible to understand the theoretical bits at all! (In regards to the intake, how do you model compressible fluid flow? Incompressible is pretty easy but air is compressible) I wish i could fill in the details but I'm not the right kind of engineer... (CSE=CS&CE) I'll stick to electronics stuff.