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As far as the drive train goes, we didn't put anything other than the V&H slip on mufflers on our '17 Trike, which is basically the same as an '18.
Runs well for the way we use it and sounds good at idle, under acceleration and going down the road.
I'd suggest waiting until you're out of warranty before changing anything that may affect EPA crap.
No need to give the MoCo a reason to void your warranty.
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