The modifications that you have mentioned will definitely bring about a change in performance but only if they are carried out by an experienced mechanic. Keep in mind that porting has to be done to a specific size otherwise it may do more harm than good.
I have a Suzuki Raider 150R, 2001 model. It is in good condition. Now I want to increase the bike's power. Can I do the following things to my bike: port it, put a K&N filter and change the pressure in the combustion chamber. After doing all these things, will the Suzuki's power increase?