if you have exits out the back, i dont think you could get enough in to make it over the rear end. as for side exits,well i would try not to get to much in,theres a hole to help drain condesation out, but to force water in at that rate,wouldnt be a good idea.
Here is something I have been doing since high scool (a long, long time ago). With a glasspack, drive until the muffler is good and hot and then hose down the outside of the muffler until it is coo again. Do this a few times and you will filnd the exhaust louder as the change in temp tends to break up the glass packing. Works for me anyway!
If cool water on a muffler causes metal fatigue, better not drive in the rain. I have done this process on 4 differant vehicles and have had no ill effects, only louder exhausts. It is not like there is a lot of stress put on the muffler. As I said in my post it works for me, if it makes you worry about metal fatigue then dont do it.
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