Stock 150f mods

I have a 2017 150f that’s stock and trail ridden.  Ive been doing a lot of reading and info gathering but most posts seem to be years old so I’ll just ask here. 

What exhaust do you like for the 150?

jetting for exhaust, air filter, and sea level?

what brand/lightest rear sprocket?  Looking to go lightweight 49 tooth.

Thanks!! looking forward to some opinions!!  

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