We have had it on the dyno several times, for tuning purposes, no power runs. As there was a major push for time (I only got it back Xmas Eve), we are still running only 1 fuel pump (I have a SX waiting), no surge tank, and the 3in intake plumbing. Also, the engine is still running in, so we are a little hesitant to spinning it to 6k while it is still young. Once all the little things are fixed, and maybe a few mods to exhaust, we will start pushing the loud pedal to the floor. But the engine sounds strong, very very strong.