Hey guys, I have a 2012 Honda CG125 that I am looking to do a budget cafe racer mod on.

I've removed the rack and tire guards.

I am thinking about reversing the handle bars, throwing on bigger wheels and springs, removing the airbox, and cutting the exhaust.

The things I need help with are removing the airbox and fitting a K&N cone onto it, as well as cutting/modding the exhaust.
Right now, the bike has a blocky scooter style exhaust. If I cut the muffler off, would I lose compression/power? I think it would look great with a wrap, and a deleted muffler.
Does anyone know which K&N will bolt onto the carb? Will I need to rejet?

Thanks a million