When I had my transmission and RMS done I requested to have the IMS retrofit done but I was told not to do it. They said it shouldn't even be a concern. The Indy shop also said "The dealership doesn't offer it so neither do we". Well Jim Ellis does offer it in Atlanta. I've since stayed far far away from this Indy shop from this experience and couple of others. I have almost 110K on my Boxster so if it blows I'm going for a 3.8 so I'm not too concerned with it