[MauiSteve]

If you're stressing about the trunk space keep in mind that whole $150 kit is removable. The lid of the spare kit becomes the floor of your trunk. You can keep the kit in your garage if you're running RFT's. Put the kit back in when your running some nice Michelin Pilot Super Sports. The thing is if you decide you want the spare kit after the fact it's gonna cost you probably $700 to $900. Really a total no brainer to option the spare kit if your doing an ordered car. Never gonna use the spare kit- put it on eBay and quadruple your $150 investment.

Note: Fitment of rubber trunk mats are different with the kit installed. Weathertech makes a mat for the top of the kit when installed- see their ordering guide. With the kit out you can use the OEM rubber trunk liner from BMW, or get the standard Weathertech liner made for cars with no kit.