Old Briggs And Stratton Motor 19r6 I Need Help Adding More Hp And Torqe For My Older 3 Hp Briggs An Stratton Engine?

I need help adding more hp and torqe for my older 3 hp briggs an stratton engine? - old briggs and stratton motor 19r6

I am old Briggs and Stratton engine from a previous front throw mower. 3HP is. I would like to add a bit more than I do? I thought that barely escaped, but by idk.l Have some K & N air intake on one hand, a little power escaped, if so, how? if theres some parts I can buy, you should. In the solid on a budget. Motors from scooter.