i have a friend who installed jb4 recently diference in mpg is huge, i mean comparing with stock, same with v5, but you can always turn to zero map (valet) to turn off jb4 or v5 so mpg will be like stock again
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E92 335i Black Saphire 6MT PROcede V5, BMS DCI, Big Tom IC, AR CL-DP's 3", AR Design OC, Forge DV's, OEM M3 side skirts, BMW Performance Wheels 19 inch 269 Black Gloss+Continental ContiSportContact 5P (400hp and 550nm) https://www.youtube.com/user/aistis7..._as=subscriber
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