Im sure you could get it from a stealership but they'd charge quite a bit. It wouldn't be worth it to get it new. The only problem with the SVT catback is that it uses the same resonator that the 4cyl and regular duratec use...  You may want to look into tour96se's suggestion and look into the trubendz. Depending on what you want to spend, this could be a good setup.
1999 Mystique LS V6
Alpine CDA-9807, Rear deck sub, Opt. TB, K&N RU-3530/MAF adaptor, custom heatshield, FSVT 17's, SCT 4-program chip, Eibach's/ST200's, Hella Fogs...
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