holes in the muffler

["Overly,Edward A." <eoverly@xxxxxxxxx>]

My spider needs a new exhaust system.  I was reading Click and Clack this 
weekend
and they were saying holes in the muffler could cause the valves to burn 
due to not enough
back pressure:

http://cartalk.cars.com/Columns/latest.html

This got me to worrying about free flow exhausts and how extractor exhausts 
work.
I suppose as long as the closest muffler to the engine is in good shape you 
are ok-
i.e., you will have sufficient back pressure. 
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