My concerns are 1) price 2) is my car going to be lean or reach on motor alone 3) How does it affect the nitrous

Any ways, the nitrous has its own gas pump and its properly tuned now. I have the UPSOLUTE flash from the era when there was only UPSOLUTE or Goldchip tunes. That's why I need the custom tune, I already got the 20hp from the standard flash.