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I think you'd see the spray respond vigorously at the site of a leak whether cold or hot - it may evaporate but you still would see the response during the process. This works very well for me on my motorcycle and other small engines as well as on inner tubes. I am certain there is a "smoke test" but sometimes simple is best - and this is exceedingly simple. If you have so much exhaust gas in the cab that you feel sick then perhaps leaning over a running engine isn't the best method to be certain so have a buddy nearby (and absolutely don't seek out a leak indoors even with the exhaust vented...IT'S LEAKING AFTER ALL). The exhaust manifold is also factory-installed without gaskets and may be a source of the leaking if you have removed the exhaust manifolds for any reason (such as adding a pyrometer).
This test is a "point-of-observation" instant response/identification type. You'll see something and know that's where the leak is, or you won't see anything and have to continue searching.
EDIT: scha0786 has identified one of the most-common causes/sources of exhaust leaks of the variety you are experiencing.
Jonathan D. Howell
Lieutenant Colonel, U.S. Army
2005 EarthRoamer XV-LT (Ford F550)
"Americans Travelling America"
Last edited by howell_jd; 12-27-2011 at 02:16 PM.
Reason: Cracked flex joint...yep, very likely.