Not what I would say a hard install, just those dang connectors are all difficult to take apart and you can expect some hand scraping to happen....

Very noticeable acceleration increase. I think drivability is better and my wife does as well. So far, I would still put it in.

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2013 535i xDrive, Imperial Blue Metallic, Oyster and Black Nappa Leather, ZCW, ZDA, ZDH, ZLS, ZMP, ZPP, ZTP, 2TB, 323, 416, 4CE, 4U1, 5AC, 677, JB4 Tuner