You do not need to get a "better" intake manifold. Those do not produce enough HP to really make a difference. I've seen guys on here with about the same mods I have and they have the Fast Intake and they're HP numbers are no higher than mine with it.
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2011 1SS/RS LS3 - Stage II Ported Heads, Stage II Comp Cam, Ported T.B., Hurst Shifter - 0BX LT Headers - CAT delete, Pype Bomb Axle-Back Exhaust - Muffler delete - 4.5 Resonated tips, Spectre CAI, - 480 RWHP 442 TRQ. Dyno tuned by ARD.
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