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overdeveloped beater
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Depends on how it's made. Some are louvered and some are perforated. The perforated ones flow the same either way. Louvered glasspacks will flow a bit better in reverse, but I'm not sure about the tone.
 

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Yes, I have read all sorts of shit about louvered packs. Seems to me like backwards would only make a marginal difference.

I wonder what glass packs on a Suby would sound like...with no muffler or anything...hmm.

-Andy
 
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