speedtech stage 3

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    What is the most power people are getting from their stock Turbos with a tune?

    I am starting in phases the transformation of my 2013 135is slowly into a 1M coupe. Definitely thinking on getting the Speedtech stage 3. For now, I will start with a MHD tune maps. That said, I like to gage the power that can be subtracted out of the stock hardware. What is the most HP and tq...
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