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Old 05-24-2010, 09:35 AM   #4
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Join Date: Jun 2008
Fan#: 56983
Location: Advance, NC
What I Drive: '03 SVT-5

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SMF gives a better PAX index than SM, so you come out a fraction better (.877-.870) in final PAX results. ST has a much better PAX index (.824) than either of the SM classes, but I have done the SVT header swap with cat delete which knocks me out of any "street" class. I did notice however that FSP has a pretty nice index this year of .838, but again, with my exhaust setup I'm out of that class too. If you aren't very familiar with PAX indexes and whatnot, check This Site out.
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