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Diesel Tuning Box – VIEZU V-Box! The Viezu V-Boxes are the most advanced diesel tuning boxes in the market. Unlike most very simple plug and play tuning boxes. The VIEZU tuning boxes are fully programmable, They actually hold a real ECU remap in the tuning box software. So the tuning works just like a full OBD tune. There is juts no need to programme the vehicle’s own ECU. As such, this s means the Viezu V-Box delivers great tuning for both cars and vans, and just like VIEZU’s ECU remapping service. VIEZU can set up and tune your tuning box for power, performance, fuel economy, or a perfect blend of both.