I was reading on Fresh Alloy that some people are making a boost leak detector for around 5-10 bucks using parts from Home Depot. The parts usually consist of:

PVC end cap
Valve Stem OR a Air compressor Chuck
Tape

Basically the idea is to find a PVC cap that will fit into the inside of the intake hose, drill a hose in the middle of the cap that is the same size as the chuck or the valve stem, mate the two together, then stick it in your intake. Tighten it down with either clamps or tape so it wont leak, and either use a hand pump or air compressor and fill it to about 15psi. Since the motor is off you can hear any leaks with the amount of air.

My question is, have anyone ever done this and if so, does it work?