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While at the dealership the other day getting my routine maintenance done, there was another 328i on the rack next to mine. That car had the afe scorcher installed (i saw it myself). The tech went looking for hidden tune detection codes, with the scorcher installed, and there were none. Based on how dirty the unit was, it appeared to have been installed for quite a while (c'mon guys, clean the engine compartment occasionally).
To me this was the acid test - connected to the dealer's computer, no hidden codes! That is not to say that somebody else's car might not have one, but this particular car didn't.
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