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A K&N drop in filter will provide 80% of the gains of a full cold air intake for significantly less cost.
Cat back is not going to net you much power on an NA car, pick the one you like how it looks/sounds
Check out the software tuning section for info on different tunes and hp gains.
Most of your power if you are staying naturally aspirated is going to come from the combination of a header and a tune which will also help to lessen the midrange torque dip.
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Engine/Exhaust: OFT w/ E85 Tune | FT86SF Catted UEL | Invidia Q300 Catback
Wheels/Tires/Suspension: Avid.1 AV-20 18x8.5 +33 w/ 245/35/18 PSS | RCE Yellow Springs | Velox LCAs
Cosmetic: Valenti FT86SF Special Edition Tails | Diode Dynamics Full HID/LEDs | BRZ Fender Garnishes
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