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I have BM3 stage 1 and I'm enjoying it. I do plan on upgrading the intercooler when I go to stage 2 though. I'd recommend going that route. For $50 you have access to all of their off the shelf maps while still maintaining the ability to go with a custom tune if you decide that their ots maps aren't sufficient.
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I rev-match from neutral to first 
6MT Mineral White on black M235i coupe
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