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      04-15-2012, 03:11 PM   #23
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Drives: 2008 E90 M3
Join Date: Apr 2012
Location: Pretoria

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Most tuners only adjust feulling because the computer already compensates for the rest. Aftermarket air intake and exausts changes your mixtures therefore fuelling. Tuners normally do not change VANOS, timing (apart from idelling), airflow heat ranges and knokking. These are very complex and this is why the BMW software makes such a difference.
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