another question, thanks for your time,
I would like my bike to sound better, little louder too ( it’s a 91 F2 ) is there a slip-on that doesn’t require rejetting??

If you only do a slip-on you don't have to rejet the bike. If you change your filter or do full exhaust you will want to deff consider it though.

so with a yosh sli-on, K&N filter and an ignition advancer what stage rejetting kit should i use?

Because of the advanced ignition I'm not positive. A stage 1 would probably be fine but I would look into it more if it were my bike.