nathant19 Sh*t Brains Joined Jan 12, 2009 Messages 20 Nov 7, 2009 #1 My boss wants a box to improve fuel mileage on his 08 Duramax. Is there a box that will improve the mpg but not void the warranty? Thanks
My boss wants a box to improve fuel mileage on his 08 Duramax. Is there a box that will improve the mpg but not void the warranty? Thanks
phale Comp Diesel Sponsor Joined Dec 12, 2006 Messages 935 Nov 7, 2009 #2 Any kind of programmer or in-line device that you install will run the risk of voiding the warranty.
L LMMdmax beerstud1 Joined Dec 15, 2008 Messages 42 Nov 8, 2009 #3 i have an mp-8 that does not effect the ecm......its for sale....will not void the warranty....pm me....
i have an mp-8 that does not effect the ecm......its for sale....will not void the warranty....pm me....
