If you're stuck with the auto (like me), there's not much you can do to get more performance... the K24 doesn't have much torque compared to smaller turbo engines and the manual's gearing seems to be better matched to make the most of the top-end power.
CAI would improve the sound and increase power a tiny bit. A full exhaust system with new headers, cats and piping could make more power and make the engine sound even better, but don't expect big gains. Frankly it's a pain tuning these NA cars compared to turbo cars which immediately benefit from chipping, a less restrictive intake and exhaust system.
I was thinking of getting a similar nav system but I freaked out when the local installer messed up my xenon kit, no way in hell was he gonna touch the internal electricals

It's some local China brand so don't expect OEM quality. It splices into the CANBUS system to allow climate control display. The DVD player unit goes in the empty space in front of the shifter, like the original factory installed Navi system. Do Kenwood or Pioneer make an aftermarket unit that fits?
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