No tune yet.
All turbo cars have some lag and it's just the nature of them. It is barely noticeable on my 335 and now f10.
Maybe you have too high of an expectation for the 535? Turbos just won't ever feel like a NA car if that's what you are after. Even the mighty M5 has some lag according to reviews.
2014 LCI 550i M Sport | 3D Design Front Spoiler | BMW Performance Black Grills | BMW Performance Trunk Lip | BMW Performance Diffuser | Painted Reflectors | Wincos 30% Tint | Supersprint Exhaust | ACSSprings | MORR VS8.2 Rims 20x10R and 20x9F | Michelin PSS Tires |||More Photos of my car here|||