Purchased a SE High-Flow Exhaust System with Nightstick Mufflers for my 2015 FLTRUSE two years ago,
perhaps not the best choice for changing mufflers down the road as the muffler inlets must be 2.25" 
. Either my ears have grown more sensitive or the Nightsticks have grown louder and more raspy, so I wanted something more mellow. Unfortunately I'm stuck with 2.25" muffler inlet options which no after-market vendor offers and although 4" Street Cannons are the only Twin Cam choice these days for the 2.25" High-Flow Exhaust System, they're not offered separately

.
Enter LADY LUCK!!! Stumbled across a set of near new
4.5" Street Cannons on eBay which apparently were take-offs from a SE High-Flow Exhaust System for the M8 (2018 P&A). Incredibly, each muffler has the 2.25" diameter inlet required to fit my header pipes!
And with my High-Flow header pipes, this is the best sounding exhaust system I've ever experienced
. The large diameter mufflers produce a very satisfying deep Harley rumble at low throttle and a nice throaty sound under acceleration, even with the cats in the mufflers. I've gotta highly recommend the SE High-Flow Exhaust System for a really nice combination of sound and performance …...at least for seniors like me

! Riding is more fun again

!!!!!!!