thank you for your reply.I should have worded the question better.I know the cat back Borla does not have the flapper valve.That is the reason I am interested in that system.I have read earlier posts of people using 2013 or earlier borla catback systems on 2014 models.Also know gm/borla uses the flap valve.Question!!!,Can or will a 2013 Borla catback fit on a 2014 without any mods.This is for a reg cab only.thanks