I brought my M in today to get a few pulls on the Dyno Dynamics and was pretty disappointed to say the least. Tune or no tune I put down ALOT lower number than I thought it would. Best run was 408 HP and about 490 ft lb TQ. I was told and have seen in other posts that Dyno Dynamics is very safe and lower than the Dyno Jet but from what I've seen it's supposed to be most accurate and similar to the Mustang Dyno. I already have an appontment to bring it back in to have a few more pulls with stock ecu instead of the Velos tune to see what the difference was.