Originally Posted by Dan12GT
You also have to consider the weather conditions. I very well may have gained HP. It was a cold day on the stock dyno so much denser air. The 2nd dyno I had was significantly warmer outside so that very well might account for the HP number to "stay the same" when in fact it probably went up. I think my stock numbers might look a bit embellished due to the cool air. There are soooo many factors that affect dyno numbers it's almost impossible to get a 100% accurate reading. The only real way to do true testing is with the same dyno, the same weather conditions, the same car, and the only changing factor be the intake. Even then not every car will respond the same.
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This is true, and also why I don't put much trust in STD numbers, because they tend to not be as comparable when it comes to different atmospheric conditions during different dyno sessions. SAE is better for comparison purposes when it comes to trying to "disregard" weather changes.