Just bought a 2008 Chevy 2500 6.6L Duramax. I don't know much about diesel motors. A few of the guys I work with have made a few recommendations on improvements. Looking for more opinions. Should I... - Install additional gauges(i.e. pyro, boost, engine oil temp, ect...) suggested to spot engine trouble earlier. - DPF Delete to improve fuel economy... I'm worried about passing emissions and if its even worth it, or just install all new larger exhaust system? - Bully Dog tuner... not looking to produce huge black plumes of money out the tail pipe, but just improve performance while towing/hauling and everyday driving, will this do the trick. - K & N cold air intake... I had major improvements in my 5.3L Vortec, will I see the same with a diesel? On another level, the truck came with oversized tires, 285/70R17, will this help or hurt fuel economy and performance?