For performance - the stage 1 tune at Abbey Motorsports is good.
Stage 1
Supply and fit plenum spacer/velocity stack/HKS panel filter and ECU tuned on dyno.
Gains of around 10/15bhp and the same in torque , throttle response enhanced in the lower 3 gears
Rev limiter and speed limiter raised.
If you have the budget also pop some High Flow Cats but do any mods before the uprev to get the benefit of the remap
The Stock Air Box with a decent filter is probably the best for performance but if you are prepared to lose a little power/torque for sound then pop charger is a cheap mod or a