As for a clutch, the Spec 2+ I had seemed to be easy to launch the car with. You can pre-load it while holding the e-brake and let the clutch slip a bit while at launch rpm. That loads the drivetrain so the shock is less when you launch.
Hold off on a CAI until you decide turbo and FMIC or TMIC.
203,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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