Nox is actually the cheapest horspower available...u can get a 50-100 HP shot kit for about 200.00 after that all u gotta do is buy the bottle...for our inlines that is definitely the cheapest horsepower available...u would sure spend a lot more for parts to get 50+ HP....
the amazing part is both actually...14's is about 6-8 secs better than stock...plus the fact that the stock engine can handle a full 4 shots of nox down a total of a mile....i certainly cant see any stock v6 or v8 getting that many runs...biggest difference though being in the strength of the bottom end....rockers would probably last longer but the bottom end would certainly go a lot quicker...