I have a couple question, first I am looking at getting new tires and I am looking for something for both the on and off road.  I use my truck as a daily driver and sometimes off road.  I currently have 35" BFGoodrich All-terrain T/A's.  Any other suggestions?
Secound, I am also looking at getting an exhaust upgrade.  I do have true dual until the muffler.  I am going to get duals all the way back.  I talked to a local shop here and they said they have an off brand that sounds like a flowmaster Seris 40 but a littler deeper.  I dont know how good of an idea that is.  Any thoughts.  I have a 8.1L and would like a deep/loud sound for the specific engine.  Any thought or suggestion would be great.
Also does anyone know the rough HP on a 8.1L 496?  Thanks to all.  

pro-comp makes a nice tire...extreme all terrain ...kinda looks like a mt baja claw...kinda.or even a cooper discoverer sst...mud terrain  

I am running hankook's dynapro MT  Reviewed by petersons a few months back. http://www.4wheeloffroad.com/techarticles/wheels/131_0705_hankook_dynapro_mt_rt03_tire_test/index.html    It sees about as much pavement as it does trails, and the tread seems to hold pretty good. I have ran several differant swampers and I do like the tsl radials. But the tread does take a beating from the pavement. My brother swears by his BF MT's. good tread pattern but you pay a pretty price for the name. As for the all terrain tires unless you are worried about gas mileage and tire drag I would stick with a MT.    As for your exhaust you get what you pay for. last time I checked flowmaster had a life time warranty on their mufflers. Does the one from the local shop have that. Depending on what you see on the trails plus just normal wear and tear can play havic on an exhaust. I run dual flowmasters on my 85 2500. Have had them on since 02 and wheeled all over the northeast and now in upstate NY with all the salt in the winter. No leaks yet(a few dents)  

Well for your tire issue u should think about procomp X allterrains, as they are a bit more agrressive than a regular all terrian and look coolor but they are expensive, your bfg all terrains are great tires that last forever, i had a set before.  As for exhauast a fat 3 inc exhaust with dual flowmaster will sound great