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I have not tried driving the car in Eco Mode since installing the chip. I rarely do so. However, I'll give it another try this week when I get the car back. (Off topic, they gave me a 428 GC as loaner; can't stand the way the newer, smaller cars steer and handle -- my e92 has that stiff steering and handling that I love).
It seems anecdotally that some people experience tangible performance boost with the RC, some don't -- and so, too, with the BMS piggyback. I'd prefer not to have to shell out $2500 for the Dinan, of which there is sparse feedback on the various forum postings. The car is fast enough stock, but hey, why are we all here if we didn't want to amp it up a bit more.
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