What do you consider hard proof? Anything I could post up here, would be quickly debunked by the many "internet quarterbacks".
I installed the D3 1.5 package on my V back in May. At the time, I didn't realize there was a good FI tuner living twenty minutes from me.
Fast forward to October, I take my V in, and we do some tuning on it. The baseline run was made without D3's box. Mods on the car were the 1&2 intake systems, and the Corsa mufflers.
It made 352.3 @ 6157, corrected, on a Mustang dyno. With a generally accepted 13% difference on a Dynojet, that figures out to 398.099, at the wheels.
Most stock numbers I've seen on a Dynojet run around 360-365.
My final numbers, leaning the tune a bit, were 368.7 @ 6344. That factors out to 416.631, at the wheels.
I think the numbers show their claims are right on the mark.
You live two hours down the road from me, you can always drive over and see for yourself.
