RSCHIP Chiptuning for almost
all BMW 4 er modifications
Which BMW 4 Er
would you like to optimize?
Check out the power your BMW 4 Er could produce.
Your BMW 4 Er can perform much better than you think.
Enjoy more power & torque and an all new driving experience.
You will love it. Untap your car’s true performance potential.
Enjoy more power & torque and an all new driving experience.
You will love it. Untap your car’s true performance potential.