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So it is not to take the place of porting. I have another car that has a ported head and 3-angle valves. The motor also has a 1 - 3/8" tubular exhaust to a 2.5" down pipe.
I probably gained about 20-30 hp by EH'ing the upper and lower intake and a bigger(4mm) throttle body. If the engine was stock I am sure the EH would have not had that great of an effect. EH is just a finishing touch.
Norm
9-5 Aero
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