Originally Posted by zurud 
I find stock IM is pretty good. Unless you are planning of more than 600hp which I think is minimal in sr world
The O2 Induction Intake Manifold was supposed to be good for an additional 25 to 70 horsepower in boosted applications but only about 7-10 horse for NA.
The stock highport intake manifold definitely has a lot of room for improvement.
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