The legality of the resonator as a muffler would depend on your local laws.  The muffler is only used to quiet the exhaust.  I would guess that if your car doesn't exceed the local Decibel Level laws anything should go.  That how it is where I live anyway.
 
Tom

could I just do what feeny did and make side exit exhaust w/o a muffler?  would a resonator be considered a muffler by law?  it seems that would be a whole lot better.  Im only 17 and cant afford a WRX by the way.

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