|
I too have 2014 535i xdrive. I wish i had bought the 550i at first because stock a 535i is dog slow.......So i tried the BMS Stage 1, also tried the JB4, then wanted something a bit smoother in power delivery so went with the Dinan Stage one. Now i am currently on a Stage One OBD ECU Flash (took 15 min). All on my stock setup with no mods. I can say that without a doubt, the Stage One ECU flash made the absolute biggest difference in power and driveability. It amazes me how big a difference it made. Night and Day...It is also VERY smooth with no Check engine lights. Pushes about 13.5 Psi Stock and it feels Unreal. Its a big difference between a Piggyback tune and an OBD ECU Flash. HUGE diffenece !!! I no longer wish i had bought the 550i
|