Big surprise while working on a 2014 3 series with a N20 engine,,,,the customer said the cigarette light was not working,,,,so I removed the cover to gain access to the fuse box,,,,,and look what if found someone installed a Dinan 1 stage piggy back for another 50hp.Looks like nothing special to install,,,,everything was just plug-in and play,,,,and some Velcro to hold it down into position,,,,the good thing about Dinan it does affect the warranty,,,they are approved from BMW ,,,,ok now for the good part,,,,the test drive,,,,you know I was impressed ,,,,you can feel the extra 50hp,,,,,the engine pulls real hard and smoothly,,,,the shift points are still the same,,,,it feels like the boost comes on a little sooner and a lot stronger,,,,the car was fun to drive,,,,I don’t know about the $1600.00