the problem with using the fwd intake manifolds is that it would have the tb aimed directly at the firewall with very little room to have a good intake set up.

the other thing to keep in mind is that they went to the mustang tb because the stock fwd is a single tb, dont remember the sizes off hand, were as we use a dual tb.

and i do remember reading that the dual set up, although each one is smaller added together flows more air. not sure if that was more or not than the mustang tb though.
