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IIRC, The si doesn't have a "sport suspension" option per se, that comes on the vehicle from the factory. There are certainly many aftermarket systems available. And, it could be that you could upgrade suspension using BMW parts from other vehicles that share components with the Z4. The sport package option includes staggered 18" 108 style rims, the "M" style seats with integrated headrest, and the sport button that when on, increases throttle response and changes the electric power steering to give more "road feel". This being on a 6 speed manual. The auto transmission guys can chime in with help here as it might be different. BTW, I do have an 08 si rdstr available if you are interested.
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