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The tough thing in asking "what will get me to 300WHP" is that the calibration of various dynos are wildly different with some yielding very conservative numbers and those that are well... feel good numbers that have no basis in reality. I think that hurleyguys estimate of 250-270WHP stock is pretty close. The only really reliable number is the comparison of pre and post mod runs on the same dyno. That way you know what the mod actually gave you as a difference in HP/TQ.
I would suggest these mods to buy you an extra 30 or so HP.
Stillen Long Tube G3
Exhaust
Resonated test pipes (ART)
The gains of headers for our cars is marginal and they are huge PITA to install so the the bang for buck is very low. Remember that you just can't add up the claimed HP of all of these mods in a linear fashion . If only life was that simple. I had the G3 intake, ART pipes, Invidia exhaust and a custom tune and dyno'ed 286WHP. It was way faster than stock, but didn't crack the 300 barrier. Guess I should have picked a kinder dyno... and then my car would have been faster LOL.
One thing I learned from tuning was that it wasn't really much of a gain in either HP or TQ to do just the tune, but don't get caught up on the "peak" number. What is more important is the area under the curve. I had a huge dip in my TQ curve that tuning was able to fix (blue line pre and post tune). That alone made the car seem faster with with more usable power across the RPM band. Have fun with NA... it is a slippery slope once you get into FI and your reliability will not be the same.
Do you know your stock numbers for comparison? 286 sounds really low even if you only had art pipe and tune.
I hear you... I wasn't happy with the number either. I don't have a stock dyno run so I can't tell you what it might have been pre bolt ons. I do know a buddy who had every bolt on for a G35 and pulled 250 on this dyno. The number itself is arbitrary, it is the difference that is relevant. The issue is that it is expensive to always do pre and post dynos. After FI, I got tuned on the same dyno and pulled 443HP... so I was happy with the improvement
. If only life was that simple. I had the G3 intake, ART pipes, Invidia exhaust and a custom tune and dyno'ed 286WHP. It was way faster than stock, but didn't crack the 300 barrier. Guess I should have picked a kinder dyno... and then my car would have been faster LOL. 
