The N/A sleeves are have the baffler in there for noise reduction. The sleeves obviously hurt flow and are a PITA to port around. I have done it but its not worth it. Get TII sleeves or I prefer 3rd gen housings because the housings don't have the holes for the coolant to go into the intake manifold. I agree that is not a overrev. that is something in the intake. Are all the apex seal there(each piece of the 3 piece seals)?
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If you wanna become ASE certified buy the RX7.
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