If the goal is drag racing a gt30 or gt35r would be best and then just set up a two step. It will boost somewhere from 5000 - 6000rpm but it wont matter because the engine won't drop off boost. DL001 has a gt3037 on his stock b18c dcr2 that just got tuned by Dave today and made 204kw at 8.5 lbs. Kick ass setup.