Add Wish List Quick view Add to Cart The item has been added RaceChip RS + App - BMW Z4 (E89) (2009 - 2018) 20i (184 HP/ 135 kW) Torque Increase (NM):66Economy Gain (MPG):20Power Gain (PS):43RaceChip RS Tuning Box - Bluetooth Version with App ControlThe bestseller of the RaceChip tuning boxes. Completely newly developed optimisation software with engine-specific tuning,... MSRP: £288.00 Add to Cart The item has been added Compare