It'll be much easier to go and get one custom made by a TRUSTED shop. It cost's about $800 (dependent on the shop). There were very few true 3" exhausts made for the MSP and they will be very hard to get. There's always the Corksport exhaust, I believe that one is 2.75" or something close to it. Unless you're running very high numbers the gain will be almost unnoticable from 2.75 to 3"