Are you sure thats crank HP?
Something seems a little strange to me. With all the mods the car is only 149HP @ crank? Are you sure thats not @ wheels? That seems a little more feasible. A stock SR20DE is around 120-124 HP @ wheels, which with all your mods would result in a 25HP jump @ the wheels.
A stock 2000 G20 which is "145HP" will put down 125 HP @ wheels on the dyno. Theres no way that a "chipped" SR20DE w/ header, CAI, etc will only give 1 or 2 whp over stock.
My conclusion is:
1) That is wheel HP, so you're car is a LOT faster than they are telling you.
2) If somehow those figures are crank HP, than something is seriously wrong w/ your engine
BTW, do you have dyno charts from your stock engine so you can compare??