Make sure you grab the main cat, don't worry about the y-pipe, SVT y-pipe and non-svt are identical, unless you see that its been optimized...
The SVT main cat is 2.25" and non-SVT is 2"... If you're grabbing it, might as well get that.
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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