Unless you are getting it tuned by a "tuner" while on a dyno, it is way safer to stay on the stock tune! Every truck is different! To run a Stage II tune and spray anything over a 50 shot is an invatation to the "kablooy club"! Dan at DC did my SCT and I have 3 tunes: Stage II when the bottle is out of the truck, a stock tune with torque mgt(qc only), speed limiter and fan temp changed so I can spray NOS and last a 2 degree of timing pulled with the last listed changes also. Dan only felt comfortable with 2 degrees timing cause my truck was not being tuned in front of them. By learning from everyone elses mistakes I will not take a chance and blow my motor by running a Stage II and a 125 shot with out being properly TUNED!!! So please if your going to spray GET IT TUNED!!! As mentioned long ago ANY FI/NOS WILL increase your chance of KABOOOOOM! As PROF said ..."Good tune = zoom. NO tune = boom."