Quote:
Originally Posted by spearfish25
Solution: add CBE to your HFCs. Louder exhaust = less high pitched noise noticed. 
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True, I hear it less now that I have the HFC's, but it's still there. And I think that HFC+CBE= too loud for me...
Quote:
Originally Posted by kannibul
But then there's the "hissing" problem - if it's not one thing it's another...
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True as well, but at least the hiss is not constantly there.