Ah I think you misunderstood what I meant. I meant that your dyno may read one thing but not likely that another one will read even remotely close. Take that 300 rwhp car to a Mustang Dyno that loads the car differently and it will drop to probably the 260 range. Heck for that matter take it to another Dyno-Jet like at Team Ford or any other DJ and it will more than likely be 10 or more HP difference than yours. Now that I have had ton's of experience in and none are ever within 12-15 rwhp.

I was not knocking your dyno or your experience just comparing other locations/dyno readings.