On my 2010 G5 Deluxe I'm running an upturned, NOS 1960's, British made 2 piece cocktail shaker, with a shower drain baffle. Works fine with stock electronics, have an occasional pop on over run. It is reasonably quiet when ridden gently, but barks when more frisky. I recommend up-turned because it will NEVER DRAG, even if shocks are compressed in a corner.
Keep in mind: Just the choice & opinion of a geriatric delinquent.
Photo enclosed....