Go and see Sean @ Munky Wurks Garage next to Best Buy in Iwilei. He's most noted for his clean engine swaps and in-house tuning via Dyna Pack dyno. I've run my 335i on the dyna pack there for shits and giggles as well just to see what the Cobb Stage1 tune was putting down on my car.
Munky Wurks Garage, LLC
(808) 848-8794
500 Alakawa St Ste 116B
Honolulu, HI 96817