When i had my evo ix, i paid $150 for a custom ecu tune.. About 40whp gain, tracked the hell out of the car at wilow springs, had no knock issues or engine issues. Companies or "tuners" like to overcharge bmw / merc owners, because they know they can. General bmw owners aren't real "track" savy u know.. i bet half the people in here will be real happy if they get custom dyno tune at $6~700.
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