Ported upper intake manifold. I enjoy mine, from Motordyne. I know there's a set of slightly used big bore throttle bodies for sale here too. As for the rest. Power gains for ported lower intake manifold are questionable. OEM headers are quite good and the 3-5 HP you'd gain from aftermarket headers isn't worth spending $800-1200.
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'14 MB Nismo | Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs.
Betty Mods
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