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Back story..... 2011 GMC Sierra 2500HD 6.0 gas. 8/2011 Purchased the truck new. 10/2011 Changed out the factory fill and replaced with M1 @ 2122 miles. 9/2012 OC @ 9350m. with PP 7/2013 OC @ 14851m. with PP 8/2014 OC @ 21672m. with PP mods are Black Bear 89 tune and Corsa catback. With...