CAI, CBE, tune. Probably best bang for buck if your not wanting to go forced induction. I did all the bolt ons (read my signature) and I regret it honestly. Car sounds great and is pretty quick but I want MOAR POWAAA. Diminishing returns really bad with 370zs after you install CAI and CBE. So I don't think you would see very much gains with plenum mods. For reference my Z made 330whp with a full axleback exhaust, intake and plenum + a tune. A Z with CAI,CBE and tune could probably make around 315whp.
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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.
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