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ITR axlebcak. S2000 mufflers are good but the pipe is only 1 3/4" going into the muffler so unless you have stock piping you'll have a restriction there.
If you want to stay aftermarket get an A'PEXi World Sport or RS*R EXMAG.
I plan to ditch the Magnaflow for the Apex'i WS2 or Apex'i NOIR. The Magnaflow is just too loud now, and I need something stock looking and not a cop magnet.