Lot's of info in find but, yes I have allot of experience with flowmaster and love them. What You buy is really based on sound You want. Most mufflers are going to help about the same in HP which is little actually. Some do free flow better but, usually to get the full use of exhaust benefit you need to go with a complete unit from catback header system into true dual 3" pipes from cats to 2 mufflers (My preference is super 40's) and come out of each muffler with 2.5" pipe to just over the axle and stop it up in stock location. 3" will not have enough room to go over axle and tuck in the factory location but, 2.5" do.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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