Quote:
Originally Posted by Nero7
What happens with the BMW warranty when you tune the engine with Kelleners or other aftermarket tuners?
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It will be voided on the powertrain components. Those sort of gains are WELL beyond what the engine was designed to produce. Such levels of tuning are sort of silly for a BMW.. perhaps if you are so inclined to tweak and tune to those levels, look at an Evo or STi.
With particular respect to the N20, I'd be very concerned about the lack of appropriate cooling after the tune, causing reduction in long term durability.