P51 Exaust Shrouds

Is there a reason why some Merlin-powered P-51s have shrouded exaust stacks
and others have unshrouded exaust stacks? I have seen photos showing both
and I am trying to figure out why. Was there a belief that one arrangement
offered better performance or engine reliability than the other?
Reply to
Mike
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ks and others have unshrouded exaust stacks? I have seen photos showing bot h and I am trying to figure out why. Was there a belief that one arrangemen t offered better performance or engine reliability than the other?
An answer from someone with more knowledge than me.
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Reply to
RobG

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