flow isn't going to be the biggest advantage with the vr plenum from what i see, they both flow sufficiently for the motor but the vr manifold has nice tapered runners and plenum shape to distribute air better it may also have harmonic gains over the hr and vhr plenums that won't show up in the flow test but could have a significant effect on torque and horsepower. best of all the new manifold set will be all aluminum for increased manifold durability under boost.
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