Well the Magnapacks would be your most agressive Magnaflow setup.
Usually (that i'm aware of) the oval shaped mufflers you see for our cars are a chambered muffler (flowmaster, mac, etc.) and the round ones are usually a straight through muffler (magnaflow, borla, slp, etc.).
Usually a straight through muffler will be louder than a chambered muffler, but not always.
You might want to check into SSS Exhaust and mufflers. I run the SSS Terminator race mufflers (straight through) and they are very loud too.
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2004 DSG Mustang Gt, BBK long tubes, BBK catted h pipe, SSS Terminator Catback, K&N cai, Steeda UDP's, Accufab 75mm tb/plenum, FRPP aluminum ds, Motive 3.90 gear, Alternative Auto custom tune, Steeda Tri-Ax, DD black bullitts w/315's Nitto 555R's, & 100 shot N20. 269/305 na, 373/528 N20
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