Looking at buying a 2011 3500 DRW, one has 56K another has 89K, is there anyway to test these CP4 before buying? see if they are starting to fail??? thanks guys!
2009 GMC 2500HD - K&N cold air intake; Edge CTS2
2015 Keystone Carbon toyhauler
2015 Polaris 850
2016 Polaris 570