Dual-map unit. You switch between maps/tunes via switch directly while driving. No need to turn off engine. Most usable combo is ECO map for long trips + Power tune HOW IT WORKS? https://www.instagram.com/reel/DEOGnfVsHM4/?igsh=MXZvcmw4dXE5ZnliMg== NOTE: If you are choosing the 1.65bar map you do need to order the 3bar map sensor if you don't have one you will find it on our website section OTHER. The 3bar MAP sensor is needed to avoid limp mode when using the stage2 map. NOTE: Use 1.65bar with caution - its strongly recommended turbo being in perfect condition. Clutch wear If using 2256 its preferred no full throttle for extended periods such as top speed on highways. This kit includes: - ECU - Simplified wiring - OPTIONAL FUEL PUMP AND FILTER - OPTIONAL GAS PEDAL Suitable for M57 engines - 184hp 193hp 163hp M57D30/D25 Custom ECU programming available below. Simplified wiring includes: Ecu plug Gas pedal plug Obd2 plug Fuel pump plug Out for constant +12V Out for +12V on switch (ignition) Out for ground (earth ring) Out RPM Out alternator lamp Out oil pressure lamp Note: Wirings may have differences from the photo shown but same placement.