I personally like my MAC off road H (if you can run it in your state) it provides a really good sounding idle and its not to crazy loud inside.
here is an example of mine
its really a two step limiter video but you get what i mean.
As far as magnaflow, normally from what i have heard a straight through muffler as magnaflow, typically sounds better with an X vs a H, H pipes sound alot better with a Chambered muffler like mac or flowmaster (mac

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-Felipe, 2002 Mustang GT 5 Speed
Track Results = 13.53@102.4mph 1.97 60' on 245/45/17 Street Tires
|Cold Air Intake|MAC 70MM Throttle Body|C&L Plenum|MM CC Plates|SCT Xcal2|Steeda Triax|Ford 3.73 Gears|Steeda LCA|FRPP "C" Springs|Kenny Brown Subframe Connectors|MAC O/R H-Pipe|MAC Catback|Strange Engineering 10Way Struts|8K H.I.D. Kit|Spec2|Nitto 555r 315/35/17 |