BMW 335 435 535 640 740 X3 X5 X6 8508091 – Small Side. High Quality Mounting Kit (Market value 30 gbp). This engine comes with a variety of turbo options. It is important to ensure that the part numbers on your current turbo match those specified in our advertisement. This Turbo has top quality Billet compressor wheel manufactured from solid (MFS) billet alloy via precision 5 axis CNC machine. It is the same size as the standard wheel but it is stronger and lighter which allows the turbo to spool up a little bit faster.