Honestly, tell him not to do it. They sound shat and do it no good atall. So many people on here put up with RST's that run like crap, then eventually admit defeat and take the DV off.

Mine is running 30psi with a GT30 and not a dump valve in sight!!

If he decides that he really wants to do it, then tee into the pipe that comes out of the right hand elbow on the top of the plenum. It runs from the plenum to the metering head. Easy.