Go find a couple long "can-opener" universal motorcycle baffles that will fit inside the V&H pipes. I'd weld a steel locknut to the inside of the big end, if you can't use the V&H mounting hole, Drill a mounting hole in each pipe several inches in at the 7 o'clock position looking from the rear, These can be somewhat tuned by shortening them. Even the short ones made the V&H on my 800 Vulcan sound good.
Like these, verify the ID of your pipes before ordering. Or, if you have an aftermarket mc shop around, they may have bin-boxes of different sizes.
Side benefit - with a bit more back pressure I got back some low and mid-range power.
Like these, verify the ID of your pipes before ordering. Or, if you have an aftermarket mc shop around, they may have bin-boxes of different sizes.

Amazon.com: XMMT 1 7/8" x 8" Motorcycle Exhaust Silencer Baffle Insert Muffler 2" O.D Pipes for Harley Electra Glide Street Glide : Automotive
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Side benefit - with a bit more back pressure I got back some low and mid-range power.