Cheapest ways to increase power

Ignorance is bliss, Obviously you havent, reseached nitrous, a 150 shot can safely be used on cast pistons, the last Complete kit i priced was about $450, thats $3 per hp. If you find something for Less let me know, ill buy it.
I work in an high performance race engine building shop. I see first hand what nitrus does to pistons. Its a cheap way out for lack of building knowledge on how to build a naturally aspirated engine with high HP! The nitrus is cheap the set up and plumbing is not! Im not against it but there are better ways!