It looks to me like the "S-type" likely doesn't have a resonator where the original resonator(s) are on the OEM exhaust, and probably comes with mostly straight-through mufflers (i.e. like the XR1s). I think, if you're familiar with Borla's "Stinger" exhaust from the 'Vettes from a few years ago, this would be along the same lines. It's less expensive than the "X-pipe" so I'm pretty sure this is as close as we can assume at this point. The images are generic so that's no help either. Summit has some nice prices if you're in the market, IMHO.
05 Hummer H2 SUV on OEM Air Ride
Forged 11.4:1 408 LQ4 (K1 crank & rods; Mahle pistons)/CPP LS3 CNC heads/BTR Stage IV LS3 cam/home ported L92 intake manifold/ported 90mm TB/custom Volant CAI/mid-length headers/AFE dual 3" CB/Corvette Servo/el cheapo lift/Cognito UCAs/Sphon poly adjustable TA/Sphon adjustable rear LCAs/e'fan conversion/DirtyMax radiator/Moroso catchcan/HPTuners/HID conversion/LED exterior lighting/LED interior accents/Autometer Cobalts/AEM WBPioneer AVH-5600BHS/Pioneer GM-9601/2-Pioneer TS-W310D4s/Obcon Labyrinth dual-12 box/lots of other little stuff