Suggestions on performance upgrades for 225

My A-100, I have upgraded to a 2bbl manifold and use a Weber 32/36 carb and fabbed up a Go-kart throttle cable. If you don't want to do anything to the exhaust, at least upgrade to a 2 1/4" pipe with your choice of muffler that has the pipe exit before the wheel are the 2 quickest and best bang for the buck for starters and work from there. Good Luck