I looked into building a boost leak setup (I used to own an SRT-4 and a Speed6) BUT you'd have to do one turbo and then the other.
The smoke machine idea doesn't make sense, I only have a leak above 10 to 17 psi, Need to pressureize the system. I'm going to buy a smoke machine, making a hose to my air filter and then put it on the dyno and make a pull and see if we can find it.