Thoughts opinions on the sound of the single or double chamber flowmasters on a 4.0..... Also has anybody tried flowsound mufflers, there double chamber is supposed to be like a 40 series flowmaster...

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2005 4.0 FX4
Tinted out (15% front, 1% back glass and quarters, 5% winshield strip), Line X Bedliner, Flowmaster Super 40, T-Bar Crank with 265 Firestone AT's
Memphis Power Reference 10 in a ported box, 400 watt amp, 8000k 55w HID's
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Mods to come...
4" Superlift