As far as the plow goes you want to keep the plow frame as level as you can so your cutting edges wear evenly. I have a 2 1/2" leveling kit and 285/75/16 tires and I'm maxed out on the adjustments for leveling the a-frame on my Fisher Xtreme V plow. I'm going to fab up some pieces to weld to the back of the A-frame to get another set (already has 3 holes)of holes to lower the plows A-frame down so when the cutting edge wears down I can still get it level again. As for the 4" exhaust I bought the stainless kit with muffler from Diamond Eye Performance for a little under $400 off of eBay. It's slightly louder but not much.
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1999.5 F-250, 7.3L powerstroke diesel, extended cab Super Duty,short box, 8'-6" Fisher XTREMEV snowplow,Hypertech power programmer III,Banks Trans Command,Detroit locker in rear end,6 disc cd changer,brush quard,2 1/2" Tuff country leveling kit in front,285/75/16" ,Goodyear MT/R with Kevlar tires on MB wheels,Rancho RS9000X shocks