New to the diesel world. Looking at a 4 inch turbo back exhaust first,will I get codes when doing this exhaust change . Will this mod mess with my warranty?I read that some have blocked egr and added finger stick, and rerouted pcv hose. Where is the egr valve at onmy 06 lly,where do you run the pcv hose to when you reroute? where does a finger stick go and what does it do is there wiring you have to do or will it plug into factory wire harness. love the truck don't want to hurt it . scott:gearjamin