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I have a convertible 135i with the DCT and an "s" tune... it's a quick, but not M4 levels. Driven properly a 6th gen will walk an M4. You'd need a lot of mods to get a 335i to M4 levels of power while remaining reliable and not heat soaking after a run or two. Besides the power a 335i will also need a way to fit wider tires and an LSD. It's basically cheaper to get an M3/4 at that point, unless you really want a Q-ship.
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