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I owned a 300C that also had AFM, although it was called something else, really did not have an issue with it. In stock form I really couldnʻt tell when the AFM went on. and it did not affect the cars performance. I put a aftermarket Borla cat back and it magnified the AFM "drone", I would really caution anyone that is planning to do any exhaust mods to wait and see if there is a system that would address this, there were some that did come out later that took care of the dreaded drone. I still am amazed that people donʻt look at the positives of the auto performance, really think about it, itʻs 70 lbs heavier, but is still quicker to 60, itʻs 26 hp less, but is only a tick or two behind the manual. If everything was equal I think the L99 would really outperform the LS3.
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