Mercedes Spider piggy back tuning chip OM651

Mercedes OM651 4 cylinder twin turbo C250 E250 ML250 cdi Diesel performance piggy back tuning chip with Bluetooth tuning tablet. Used for only a short time before selling my 2011 C250cdi, The chip was very easy to install “less than 30 mins” and made a very noticeable power improvement, which can be adjusted to various settings while driving with the Bluetooth tablet supplied. It said to make 30-40 hp increase in power and 20-30% increase in torque and reduced fuel consumption. I found running on the settings 1-2 click down from the maximum setting had the be results in power and fuel consumption