No but I trust their figures, one of the highest quality exhaust manufactures wouldn't lie about their numbers. I keep meaning to get mine back on the dyno whilst the weather is cool but the gains after installing the exhaust felt similar to the intake on my seat of the pants dyno.

I prefer the one piece design of the Milltek over the AWE, more joints means more problems but I definitely want to keep a resonator on the system and the AWE seems to have the advantage in a larger resonator over the Milltek.