Originally Posted by caymandive

You need to get your charts with SAE correction turned on and make sure the smoothing factor is the same for both sets of runs. This will eliminate the weather variables. From what you have posted, we can't say either way how the car has responded with a few thousand miles put on her. Something else that may help is to get the runs overlapped from both dyno sessions. You may have gains in the power band, but not at peak numbers. See if you can get the shop to load the runs on a memory stick and load the files into Winpep you will have a more accurate representation.

If your car is still stock with 15,000 miles or more you may want to dyno again down the road. I don't think driving 5900 miles will yield any real measurable change in the engine power. Too many variables when measuring such small changes in power.