B18a Or B Im

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i'm building my crx with a b18a and was wondering if there was any significant advantage of use a b18b intake manifold. i've heard somewhere that if flows better than the a's manifold. i can get the manifold from the guy who's building my motor for practicaly nothing. he's willing to swap evenly because he has no use for the manifold.. thanks.....
they both suck. get a skunk2. its cheap, and flows much better. 8hp dyno at the wheels on a stock motor.
built- boosted, it only gets better