HELP
 

I have a 2014 Chevy Duromax 2500 HD. To keep down the exhaust gas temperatures I have added the following:

5" stainless exhaust after the PDF (money wasted), Performance air cleaner and intake and A huge aluminum intercooler made by Mitsumoto ( I hope I spelled it right). I have an Edge tuner I use mostly to monitor performance features like clearing or reading error codes, its gauges capability and its ability to run a manual PDF regeneration. When I climb steep grades I hit the EGT warning set at 1350 degrees for about 10 to 15 seconds then clears right aways

Firstly what is the max EGT for a 2014 year LML. Secondly what more can I do to lower my EGT more. I would appreciate if you can suggest what equipment or brand is good to do this. All answers appreciated.