re
best sounding is an opinion :wink: i can say that cobra's are popular pipes for the 800,but so are vance/hines,hard chrome,samson,the list goes on and
all of them work well -since you have jetted your done with exhaust(don't know if you have baffles)next mod is for air.put in a low restriction air filter K&N etc,modify the stock air box,or pull the whole thing off and go with a hypercharger or other similar intake but be aware you will have to re-tune the bike(maybe rejet again)-that would be the direction i'd go at your stage of the game-good luck and ride safe!