As far as I am aware, if you or anybody else removes your top speed limiter, your engine warranties are in fact voided. I specifically asked my BMW SA this question. User beware! And, BMW can see engine tunes and will negate your engine warranty if they see those as well. They might even void your factory transmission warranty. And I am almost positive this particular tune will void your factory engine warranty at the very least. Just be very careful with this, you could find yourself with no factory warranty very quickly.
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