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280 Posts
I have the 4040XL with the cat deleted. It sounds great, not to loud or with any drone quite at highway speeds but louder when you get into the pedal. If you put it further back next to the axle (12" away from the bend for the axle) you will be happy and get no drone, the 4040XL has a small resonator in it that will keep drone done but not restrict the flow.
