| All told, I spent about $4 and maybe 1/2 hour of my time making this. 1.Go to Home Depot. 2.Purchase the following:
3" PVC Threaded Plug and
3/8" MPT connector plug 3.Drill a 3/8” hole through the top of the PVC cap. 4.If you have taps available, tap the hole with a 3/8” NPT. If not, carefully thread the hole to accept the fitting. 5.Seal the threads with your sealant of choice. Silicone seems to work well. 6.Using a grinding wheel, angle grinder, sandpaper, or an appropriate instrument, grind the threads of the PVC cap down to just about where there is no more thread showing. It should wind up relatively smooth. You’ll want to test fit it as you go. You’re looking for a nice snug fit. I put a slight taper on the end to facilitate easier installation into the MAF receptacle.
 7.That’s it. To use, simply remove your MAF from your “T” hose, under the nose panel, and insert the boost leak tester in its place. Tighten the clamp to make a nice snug fit. Regulate your air compressor down to 5-10 psi (PLEASE NO MORE THAN THIS. YOU CAN DO DAMAGE TO YOUR SEALS IF YOU OVERCOMPRESS YOUR SYSTEM) and attach your air hose to the fitting of your tester. You will immediately hear any leaking air that you might have. Be sure you already have a good supply of air in your air tank, so it will be able to supply your test without having to kick the compressor on. Obviously, if the compressor is running, it is too loud to hear any boost leaks.
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How to Make a Simple, Cheap Boost Leak Tester - 
