400rwhp is attainable without porting the heads. If your on a budget I would start with a CAI, tune, smaller blower pulley, underdrive pullies, smaller crankshaft pulley, LT headers, midpipe, and see where that will put you. If your not at 400RWHP I would think your damn close. Than you could decide on porting the heads or not.
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Twincharged.....the only way to fly.
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