long story short I just purchased a 2016 GT. I really like the look of he new gloss black RTR 19"wheels however, I didn't get the PP on my car and I have 18" wheels stock. I was wondering if the change in wheel size would affect the speedo in this car. im coming from a 99-04 stang so im trying to learn these new s550s. also im a real stickler for badging I was hoping the ford center cap would fit? I have looked n searched cant seem to find a solid answer.