Hey I just installed a Doug Thorley header on my 2011.
I encountered some problems that The Truck Shop in SD helped me out with.
1. The Air Switching Valve contacts the header air tubes to the point where they are almost one piece and unmovable.
2. The Intake Pipe Insulator was nowhere near bolt on ready and had to be heated up and bent.
3. There is an exhaust leak where the Intake Pipe Insulator bolts up to the header but I am going to address that tonight.
Has anybody else encountered these problems?