I made the following upgrades and am very happy, until I brake down and put on a supercharger.
Cold air intake
Throttle bodyspacer
Proflash computer programes
Flowmaster true duel exhaust. I used 2-40 series flowmasters and ran 3" from cats back to muffler and to axle and then had to go down to very short piece's of 2 1/2 to get over axle as it was to tight to get 3" all the way out. It made the flowmaster tech happy as he keep harping we would be taking the breath away from engine, which i understand what he is saying but it is running good. Besides Magnoflow is less restrictive than Flowmaster and they do not worry about breathing as their muffler is almost a straight thru muffler. I hope this helps but there are many more experienced guys than me as I have had My H2 since May 28, 2004. Many of the things I did I knew to do from other trucks I upgraded but, i wanted the vetrans feedback as this is my first big treat to myself in my whole life time. Listen to what these guys say. I'm lucky I stumbled on to this site.
Rick
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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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