That might work. From what I've read, our cars are recommended to have a minimum back spacing of 42 mm. Going to 40 mm might rub on the inside at full turn on the wheel. What size tire do you plan to use? Do you have or plan to get lowering springs? A 205/40 17 would probably work, but with the 40 series sidewall, you feel A LOT of the road. 205/45 is stock for the MP3 and much better at absorbing bumps, but still gives excellent control. 215/45 is what the MSP's come with and I know several MP3's that run those on stock rims, which I think have a 45mm offset.