I found that the chipexpress one works well with the 535d. I tried one other one from bluespark automotive but it kept putting the car in limp mode and it did not seem to add much power either. (It was £200 wheras the chipexpress was £350 - with a voucher code)
If you email them and ask them for a voucher code, they may send you one. (worked for me - got £50 off)
Good luck.
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Last: 330cd Sport - Silver Grey, 335d M Sport Coupe, F10 535d M Sport.
Current: AW F21 M135i, Coral Red, Pro Nav, Vis, HK, & Clunky Adaptive Suspension
Current: F15 X5 XDrive 40d M Sport - Space Grey, lots of toys.
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