I have the chrome pack, and I think that there is a few bits of outside trim that is added, not that I have noticed much difference. On the inside though, there is basically chrome added to anything round i.e. speedometer, air vents cup holders etc. It does add a nice finish. The stripes as you have guessed are stuck on, and yes mini charge a fortune for this privilege (And they don't go right to the edge). You can get them made in any combination of colours and fitted professionally for around £65. I think you can find out the price of the sports seats my "Building your mini" in the mini web site. Hope this is of some use to you.