What chip?
Big power from big cubes in N/A form = $$$$$$$$. Many of us don't have money out the *** to build a big cube motor that hauls butt N/A and many of us can't afford 3 grand for a blower. N2O is cheap and adds a ton of power. Some people already have a killer motor, but also have N2O to push it over the top(RadicalGT)
Also, if it's a trailer car, it had better damn well be able to beat a street driven mustang.