Max N/A horsepower from a B16a2?

So your friend wants 300 hp; it can be done. The cylinder head needs to be his focus if you want to run naturally aspirated. High horsepower means high rpm. And with 9-10,000 rpm you would tend to get valve "floating" on these b16s. Porting, polishing, valve seat and valve enlargement, and especially heavy duty racing valve springs to keep valves from floating, racing high duration cams etc. For the block, the hollow water jacket area needs to be filled/ beefed up, then bigger bore along with a forged connecting rod and steel crack to sustain the load. The funny thing is this. He has globs of horsepower at what rpm? High horsepower is attained at usually high rpm for these b16a2 engine...sacrificing low end torque. So this means that he has to drive around like he's mad at the engine. Meaning he would need to keep his rpm in the upper region all or most of the time like race cars. Driving around the city block at 5-7000rpm all the time gets annoying because you got no torque. Doing N/A setup cost much much more ( as in double or more )than if you do forced induction (turbo or supercharged) on comparable power gains. Your friend would spend 7-8000 bucks for a setup I've described if work is done at a pro race shop. Then....can he p the state emissions test..?? that's another answer..