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Jordan, you have no proof your engine was running lean and detonating due to AA bad tune, or SC kit. Lots of other tuner and even car makers ot just BMW revise their ecu mappings. This does not mean the previous maps is bad and harm engines. You still have not told us whats the story with the other 2 cars, and proof should along with that story.
Imo, everything should have been done inhouse. The kit should have been installed at your shop, you should dyno tune your car. Also, meth same for NOS can and will clean, meaning it will turn things white. Like I have said, judging by your pistons I dont think you were running lean, specially not lean enough to cause engine failure.
This is my opinion from pictures, I have built, torn down and blown my own motor on my own race/street car. No its not a m3 motor (I dont have balls to play in the $20k motor) category).
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