When I look at my ETH Mustang dyno charts the stock w/275's hp curve is quite flat between 2000 and 2800 rpms. Peaks at 2450 rpm which is only 15 or 20 horse over the reading at 2000 or 2800 rpm. My Dynojet curves look almost the same but with the way the Mustang loads the engine down, and how it takes into consideration tire friction on the rollers, I trust it's figures more. My GTech says the greatest G's happen at around 1800 or 1900 rpm when the touque curve is peaking.