cipan, those are from Toyota's engine right? Hmm short & straight manifold, u'll definately lose alot of low-end torque. I wonder if it's actually possible to fit stock intake manifold (eg curved intake manifold of Proton engines) with those throttle bodies, at least still can have reasonable low-end torque. Or at least make the manifold longer.
RPW Australia does have such quad TB (that can be fitted with stock manifold) but I don't know how much is the price.
Anyway, this is the ultimate N/A mod I've always aim for :p