to swap just the lower black plastic part of the rear bumper from a justa to a S? i think i'd like exhaust to exit on one side rather that the middle.

 

I think you would have to change the complete bumper.
Another issue would be the exhaust system itself.
The MCS requires a cat back style of exhaust because of the SC.
You could do that by installing a aftermarket R50 system.
You would have to put in hangers, etc. to do it.

 

i think i just found a thread that answered my question

 

for the exhaust i'll just add an aftermarket muffler to the stock exhaust. so i dont have to use a bunch of crazy bends to get back to the middle.

 

these guys seem to have done it
https://www.northamericanmotoring.co...on-needed.html

https://www.northamericanmotoring.co...177-post4.html