Nope, no specs on the waste gates. The turbochargers are Sportec units. I don't believe they are RS6 based. Milltek down pipes and cat back.
You may have me confused with somebody else because I never tried running more than 14psi on these turbos. I haven't touched the tune either, so I'm not sure if the waste gates are capable of letting you run more boost or not. I never really got into it. Lost interest in it shortly after purchasing it last spring.
At only 14psi, this car beat my old grey RS6 by 2.5-3 car lengths. That car ran a best of 11.59@118 in the 1/4 mile.