The hardware should be a non-issue. Obviously you won't have a warranty from BMW on the actual aftermarket parts, but they don't void your entire warranty. I would be more concerned with the tune. I don't believe Eurocharged allows the end user to flash back to stock. I would not run a tune under warranty that I can't flash back to stock myself.
If the free maintenance is your only concern it's a non-issue. I've brought my car in and they don't mind at all.
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