[btwilson86]

I personally like them on a GTE, but I would advise against it on a GE. Couple big reasons is that the ACIS system will no longer work (or be there), and I would think that the rear cylinders will be starved for air due to the increased distance air would have to travel after entering the FFIM (this will also reduce the air velocity thanks to the 90ish degree turns the air has to make to enter the plenum runners). So basically you'll lose some significant power/performance.

These tend to work okay on turbo models because the boosted air will pressurize the intake manifold so air will be readily available for all cylinders.

Stick with the GE manifold. It's design is one of the best possible ways to disperse air in a fuel injected inline engine. Besides, the heat transfer from traveling over the exhaust manifold/headers and engine is minuscule.