I would have to recomend the Magna-Flo, only because I have them on two of my vehicle's (H2 & Mustang Cobra) and they sound great.
Did I mention they are stainless?
Magnaflo.com
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2004 Hummer H2 " Metallic Red "
20 inch Mojave's (Teflon)(325/60/20) BFG A/T's
MagnaFlow kitty back...Hypertech Tuned..Music to my ears
HCMI Member 50043