I don't think there is that much of a difference between the Supersyn and the regular Mobile 1. If its within a dollar or so price difference I'd say try it out. Anything more than that I'd be weary of, but you do get a free coffee mug, and free things rule....
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Chris Jarrett
99 Black GTP
14.35@ 95
Fully Loaded
Reflective Badges Everywhere, S.S. Grilles, Thrasher CAI,
Painted Calipers,
180 T-stat, titanium tint,Blazertech 3200's, ASP 3.4
Chinny's Rims