Is there any way to make my signature change apply only to my future posts and not my past posts.

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No.

Alright, I guess I can live with it... *sniff sniff*

The forums are completely built on a database. All that signature does is pull up the entry you have in the database for your sig. To change that, we're talking about adding entire new table systems, increasing the bandwidth required and time to process information...all for a never changing sig that most people want to completely change anyway. Sorry brah.