A little tweek to the exaust

Wondering what’s the best route to improve the sound and aittle more umph would be a welcomed suprise without making alot of changes. Looked at just replacing the spark arrester with a aftermarket that advertises to be all that but alittle hard to beleive. Dont want to spend alot of money, but would like a little beefier sound and more power is always nice but dont want to do anything that may hurt the machine. Any suggestions?