what are the weight differences between the stock and MS bumper and kit?

 

I didn't have the aero parts so I'm not sure about those, but in comparison to no body kit: I thought the MS front bumper was lighter, but those heavy *** fog light brackets make it much heavier. The skirts are really light; same with the rear. Besides the front, all the other parts are additions.....added weight compared to stock. Seems negligible though. The real question is: Is it worth it?

YES. the MS kit makes its look like a completely different car.