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If you're using the stock GSR (P72) ECU, and you've got a Blox intake manifold, make sure that the IAB control (secondary butterflies) for the stock GSR manifold gets disabled when the ECU is chipped. It's just an easy parameter setting in the tuning software, so just make sure that the tuner does that.
Just get your ECU chipped. It's an easily reversible modification if you need (cut a jumper wire inside) and it's pretty cheap. Whoever tunes your car can do this for you.
get a kpro and get it dynoed it tuned at a local shop
kpro on a bseries motor? 09er. stick with your p72. get a crome chip, or go to phearable.net. you can use a bunch of different tuning/chipping methods, Hondata s100/s200/s300, Neptune, eCtune, Uberdata, etc