It doesn't sound good in my opinion. Your jetting may be a little lean, but a turn on the mixture screw would solve that problem.
I don't think your going to see a noticable power increase if thats what you are looking for. Plus there is the whole throwing sparks on to dry grass, starting a forest fire possiblity; however unlikely.
it wont hurt anything, its just louder and it doesnt make it any faster. i leave mine out all the time and it doesnt effect fuel mixture or anything. its just there to do what the name implies, to catch sparks that come out your exhaust
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