I very much got the sense chatting with BMW (at length) that any engine-related mod, including a tune, will pretty much void your warranty in the event that something goes seriously wrong (whether actually attributable to the mod or not).
In any event, I waited until the warranty expired as well before modding it.
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TiAg | ZCP | DCT | Euro MDM | aFe filter | MS Pulley | Akra Slip-on | MS Spacers | 255/275 M4S | H8 180s
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