First off, I know there is probably a thread somewhere with this exact answer but I couldn't find it after going through 3 pages so...

My question is since the MCS has a special area for the MCS exhaust in the middle instead of on the right side for the MC can you switch the MC trim/rear valence onto the MCS rear bumper? And I'm pretty sure you can put the MCS front bumper on the MC but I'm just making sure. Thanks Dan.

 

Yes. I did that exact thing on my 2003 Cooper. I do not know what year the S bumpers are that I have, but the trim swapped out perfectly.