Originally Posted by MikeJabb
That's completely unrelated. Its been discussed in other threads.
I don't blame you for not reading the entire thread, but it's already been pointed out that this is no different to the car than installing an aftermarket exhaust.
FWIW I've been running like this for over a year now. What's more, I've been to the dealer 2 times for routine service and they never said anything.
FYI, I was talking with my dealer about what might void the warranty, and they said anything aftermarket could possibly if it is found to have caused the problem. He gave an example of a 2009 335i with a full exhaust system that threw some code eventually and they couldn't do the warranty work because of it.