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I have looked at this option. Here in NZ the Schnitzer stuff is backup by BMW, so at the moment this is the only tune you can get that keeps the factory warranty. Pricey though and doesn't seem to be that great gains wise.
From memory when I was looking at the catalog the tune includes having to get the Schnitzer rear muffler and a Schnitzer mod to the gauges (320kph speedo or something?). Annoying thats partly why it's so expensive cause it's not just a tune.
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