Might as well replace the wastegate and boost controller with a good aftermarket electronic boost control system to ensure stable and safe constant 15psi boost whenever at full throttle and load. Straight pipeing would obviously unleash more power at the cost of more noise, though not to an intolerable degree thanks to the turbo. That said, the Mitsubishi OE airbox is in fact an extremely well engineered intake system, going open pod can in fact be a downgrade both performance and off roaf durability wise. Hot and dirty air does not create more power. If intake restriction is a problem, modifying the OE airbox intake hole for more airflow makes more sense.
