The previous owner of the exhaust add the drone cancelation pipes to rid the cabin drone noise at 3k rpm at highway speed. After install he claims that the drone noise it literally almost gone. [ http://i150.photobucket.com/albums/s112/j3kings/24565441-E737-42DB-A6CC-F548776A3D4A.jpg ]> https://www.youtube.com/watch?v=cILip2l0J6o
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