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    CR140 Flapper Valve Performance...

    Looks easy enough...so when does it go on your car so we can see the results? :)
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    CR140 Flapper Valve Performance...

    This interested me so much, I finally registered on the forum! I definitely understand that anything blocking airflow in the intake manifold would reduce performance. But I have to imagine the engine is manufactured and tuned with these serving a purpose. Removing them really has no negative...
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