Quote:
Originally Posted by StockTalon
A phenolic one will help keep heat out of the intake manifold since, most cars have coolant lines running through the throttle body. It also, indirectly makes the plenum larger.
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The time spent making it isn't worth the gains you'd get from it. Lengthening the intake runners with a phenolic spacer, you could fab this using a gasket to match the ports, would likely be a better option. Until someone tries it, we'll never know.