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drone i think is like the little humming or buzzing sound when the exhaust is around 2K rpm. are you looking for performance or just sounds and look? MRT 2 wont help the performance much but will sound nice and take the suitcase out of under your car where as you might see i little bit of gains from corsa. Look at solo cat back it is drone free supposedly i havent heard one but have only heard good review.
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