Definately worked for me.  Found the leak in a minute.  Thanks for the tip.
William
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From:         Dennis <guskersthecat@YAHOO.COM>
Subject:      Re: Exhaust leaks

I ran a shop vac pipe into the tail pipe and sealed it with duct tape. The
shop vac was set up to blow, not vacuum. With the shop vac powered up, I
then sprayed soapy water on the exhaust with a small spray bottle. In a very
short time the leaks will foam up. Bob's technique of placing a rag over the
tailpipe didn't help me find the small leaks (and there were a few) in my
custom fabricated exhaust. This technique is also nice as the van isn't
running, therefore no heat.