Any one have a link or instruction on how to? Need to replace my side vents.

 

Edit: My bad, I thought you meant the rear bumper.

I have a lot of experience with removing the front. The 21+ is almost no different that the previous year 3IS. Cover tabs come off under the hood, then three screws and two tabs on top, screws underneath, then two screws in the wheel wells. Snap off the sides, and voila. The video below shows 2014-2020 version, but again, almost identical.