Not sure if it will work on a 928 because it "looks" like it plugs into an OBD-2 receptacle, BUT, Nology (www.nology.com) Has a performance meter out, similar to the G-Tech, but you plug it in to your own PDA (Palm Pilot, etc...) or PDA phone. Does all the same stuff as the G-Tech: HP,torque, 1/4 mile, 0-60, etc.... Pretty cool looking gadget that looks very practical if you already have a PDA.