Thread: Tuning the L99
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Old 08-12-2008, 10:32 AM   #3
Lifted07Sierra
 
Drives: 2007 gmc sierra
Join Date: Aug 2008
Location: modesto, ca
Posts: 87
I dunno, but Ive read several threads about people deciding between the manual and auto and they say manual because the L99 cant be tuned because of the fuel management? :seesaw:
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