Hey Dan,
If you go with the 50, let us know how it sounds. Midas has now dropped their Ravin line and is going with Flowmaster. I went their shop a while back and they recommended the 70 series. I guess the muffler volume in a 70 is less obtrusive (than a 50) but you still get a great low rumble.
Also, "they" say that the pipes on the Hummer are large enough that a whole cat-back is not necessary to get similar results. Who knows, but I am thinking leaning toward changing out only the muffler this time. The Corsa Sport cat-back I used to have sounded too much like a semi-truck. I rather have a low, powerful sounding rumble like the Borla or Flowmaster.
Going back to your question, the 50 Series Delta Flow sounds fantastic. However, the 70 will give your cabin a break on noise. I had a 50 series on my Tundra and that sucker was loud!
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2006 Fusion Orange Limited Edition H2
2008 Greystone Metallic / Sedona H2 (Sold)
2004 Sage Green H2 LUX w/ Nav (Sold)
2006 Black H3 LUX + Off Road (Sold)
2003 Yellow H2 LUX (Sold)
2003 Pewter H2 Adventure (Sold)
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