To my knowledge, the only suspension modification available for the 2009-2010 Vibe GT is the
TRD front strut brace, although for the price, I don't know as that it would really make much more of a difference then the stock front strut brace. The suspension options are really limited for the 2009-2010 Vibe GT since it has IRS (Independent Rear Suspension). Honestly, questions like this will be better answered on Matrix Owners because the members there do a lot more as far as lowering and other suspension mods with their 2009+ Matrices. There are only a few members here who have lowered 2009-2010 Vibes and only one member that I know of that has the TRD front strut brace and TRD rear anti-sway bar (but his is a 2.4L Base = no IRS).