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The DCT clutch only slips past 450wtq which is only really achieved on the N55 with methanol injection and even then you would have to have it on an aggressive setting. Just going FBO without methanol injection will not have any issues and even with methanol injection if you don't run super aggressive numbers it would be fine as well.
JB4 is one of the best tunes available for the 135i's and is completely safe.
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