Originally posted by Dan Nixon:
Actually, you both could be correct. With a near stock Duratec like the example with the KKM only, I expect gains are minimal. But as you start opening up exhaust, headers, SVT intake manifolds, etc. the smaller t.body may become a real bottleneck so if it is changed after all these mods apparent gains may be substantial.
but still, the bottle neck is the size of the port opening in the manifold. I mean, you may get a couple HP by opening the path to it, but it still has to go through that hard opening, unless you opened it up with a grinder or something, which, now that I'm thinking about it, wouldn't be TOO hard to do.... just open up the gasket as well. (sorry about the run-on). In all honesty you might gain the extra 1-2 HP by just grinding out those mad bumps in the port and saving the $85 you would've spent on the T/B for something else. I think I have a picture from the October Meet where we did it on my UIM, I'll try and find it and post it later
-Chris
