Tone won't change with the j-pipe just remove the drone if the correct length. An intake won't do anything for drone.
I'm sure it's possible to fit under there but you may need a custom made solution versus a pre-bent kit someone sells. A resonated x-pipe will quiet it down some and maybe reduce drone a bit but I doubt it'll remove it. The drone comes from the 3" pipe size and a lower speed exhaust flow area that causes turbulence. Dynomax has mufflers with internal valves that remove drone although I'm not personally too keen on putting a big valve in my exhaust.
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