My experience...I dont have one on my Volvo, but my 1976 BMW 2002 restomod is my daily driver and I have had one on my car for about 5 years...about 60-70K miles. Not a hiccup. In the BMW world the failures that we are seeing is oil getting out of the engine into the distributor because of high pressure and a seal. This seems specific to the BMW M10 engine and I have not experienced it, Full disclosure...I was a beta tester for the Bluetooth version. I had an issue with my beta unit that was software related. After it got warm, you couldn't change the curves until it cooled down. I bought a production unit when it was released because it made my car run so much better. I'm a fan.
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