My question is rather straightforward.
I know that when leasing you have to return the car in the original condition however, what happens if you installed a Mini Rear Aero bumper and you decide to return it like that.

I haven't been able to get in touch with our sales manager, but i called a few other dealers around and they said (without enthusiasm) that as long as it is an original Mini part that is fine.
So going by this I should be fine, right?

 

As long as you stay with original Mini parts, you will be fine. If you decide to modify beyond that, keep all the original parts to reinstall when it comes time to turn the car in. Mine started as a lease, but converted to a purchase when I realized there was no going back.

 

I'll bet no one bothers with a sc pulley though (ie returning to stock size)