08ImportKilla

I am sure this is true, but I saw a customer car on brenspeeds website that was using a 150 tune with stock internals.

http://www.brenspeed.com/customers/2006cooper.html

Gene K

For a given cylinder pressure at a given rpm the engine doesnt care if its arrived at via chemical (N2O) or mechanical (Supercharger).
That said the killer with N2O is excessive cylinder pressure at low rpm. Always make sure the rpm is sufficient for the amount of N2O you are using. For a given cylinder pressure/rpm you will see a a higher rwhp with N2O due to reduced charge temp and lack of blowers parasitic drag.

orangecrush

Yeah I just ran my car after a dyno tune & it makes it a whole diffrent car. it is awsome. so I may do a 100 shot & save for a 5.4 then turbo that