hello everyone, new bmw owner and first post to the forums, has anyone put a k&n air filter into their new 09 . i have them in all my cars, will it harm or void the warranty. i know some cars electronics will adjust to the increased air flow and i'm assuming the same with this car. any thoughts or info would be helpful.
You will void your warranty, I suppose you could put one on ,but every time it goes to the dealer you will have to put the stock filter/box back on, then that might raise eyebrows as the filter won't be very dirty for the mileage.
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