Not sure why you would want to,I think all you will gain is more noise.Sorry that's the dad in me talking. I took out the spark arrestor on my kids bike and I didn't notice any more power just more noise so I cleaned it and replaced it
unbolt spark arrester on the end 3 8mm bolts & clean the air filter you should notice mabe 5% better giver take... sounds like a 450, cool....... run good gas too, not huskey...... 91 octane shell,esso....
There are aftermarket exhaust systems that will improve hp, the full system will run you about 500 to 800.....You can run it without the spark arrester, it will let the motor breath...I wouldnt run it without the exhaust though....