BMW //MDiscussion on the BMW M1, BMW M3, BMW M5, and the BMW M6
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I've been to RPi's shop and can say their R&D using the dyno is legit.
Please have someone with a full catless Gintani exhaust vs. full catless RPi exhaust with NO turn dyno at RPi's shop, same day same time and post a video or something. I'm eager to see the results!
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