this is from another member that i read
"I had non rfts at the rear and rfts at the front for about a week.I wouldn't recommend it.It felt like the rear of the car was pushing itself through the front it wobbled at speed and over 60 mph the car was very unstable. Mine is only a 320d god noes what would happen in a 330d"
And Pilot super sports are AWESOME tires. if your not looking to spend to much money, you can always find some used Michelin tires on Ebay that were used a little bit for under 250 Shipped for a front or rear pair, ive bought from ebay twice and they work out great. and I dont think BMW NA will believe you theyll probably think you were burning rubber purposely. and also the dealer will mount and balance tires for 120$ for all four, most shops dont have the right kind of mounting machine for low profile tires.