I thought you were goin L36 in the RX-7? Awesome. I agree with the F-Body L36 exh manifolds. good call. I would, in my limited experience, recommend 2.25" or 2.5" That's what I'm running all the way back, and I have PLENTY of flow. Food for thought.
When you gonna post pics?
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WizAire CAI w/9" K&N & HV3, 2.5" d/p w/h/f cat, Cobra CB, PowerSlot slots w/Hawk HPS, GR-2s, GMPP handling kit, NextLevel STBs, Pilot Sport A/S Plus tires.
98 L36/MM5
RaC