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I recently bought a used 2006 Mega and I was wondering if there is a way to tell if the previous owner used a programmer? I was interested in purchasing a programmer such as an EFI or Smarty, but if there is already a programmer installed I don't know how that will affect the perfromance... any info is greatly appreciated.
 

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If you don't have the programmer the previous owner used, and/or suspect there might be a tune left on the truck, your best bet would be to go and get a clean flash done from the dealer and start fresh.
 
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If you know someone with a smarty, borrow it and return your ecm to stock. Then go EFI LIVE.
 
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If you don't have the programmer the previous owner used, and/or suspect there might be a tune left on the truck, your best bet would be to go and get a clean flash done from the dealer and start fresh.
I agree with this. If you are worried about it get a clean flash from the dealer. Or, when you get efi live you can read or try to read it out.

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