I have a decent relationship with a guy in the Toyota Dealership Service Department where I bought my truck. He recommended that I should just go with a MagnaFlow Muffler and use the existing exhaust system on the truck. He said the cost for the muffler for the truck would be $80ish, and another 30 or so for the install at a muffler shop. Two questions for you guys out there smarter then I: 1.) Will just replacing the muffler give me the same approximate gains that a whole cat back system would, and 2.) What Magnaflow muffler would you guys recommend? I'm looking for any type of insight you all can provide. Thanks in advance.

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Slate Metalic, 5.7 L V8, SR5 DC w/ 6.5' Bed & TRD - MODS - Steelcraft Stainless Steel Nerf Bars, Carriage Works Polished Aluminum Billet Grill, Line-X Xtra Spray-In Bedliner, Toyota Underseat Cargo Storage Tray, FormulaOne Driver & Passenger Sides Window Tinting