I've got a 2011 ram 1500 hemi. 5.7l. I love this truck. I currently switched jobs. And driving 100 miles a day. Averaging 16/17 mpg. It's got the Diablo trinity programmer. Magnaflow exhaust and k@not air filter. Was wondering if I put headers on if it would help the mpg? And if they do should they be long or shorts? And what's the average mpg gained?