Thread: **BPMSport E9x M3 Performance Engine Tuning Software** - E9x M3 Tuning Leader
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      11-22-2018, 02:24 PM   #973
slowm3sedan
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Drives: 2011 BMW E90 M3
Join Date: Mar 2014
Location: Los Angeles, CA

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What is the cost to upgrade to stage 2? I have stock exhaust system now, but planning to go full exhaust by summer.
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