You are about right on stock muffler size.
We did 3" if I remember right to the mufflers and then down to 2.5" going out so We had room for 2 tailpipes over axle in stock tailpipe location. The reduction in size was also to mantain better back pressure as We were alittle concerned about flowing to much exhaust and hurting performance since I had headers and the dual chamber muffler. Just felt like beng a little cautious with back pressure. Maybe worried for no reason on that issue but the sound is sweet.
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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