Yoshimura sounds funny 10"

Ok so i bought a yoshi slip on RS4 stainless a few months ago. Anyway my friends tell me (and iv heard it when someone is riding it) that the yoshi sounds weird like a vapping sound, bee sound etc, and i have to agree. But i see vids on youtube that sound nothing like this, is it because its not a full system, is it the mesh on the spark arrestor?

heres a vid

My buddys full Yosh on his 2012 KTM250sxf souds funny also. Dont know why. but i thought it was just me.

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