450Beater

Ive been wanting to get more power out of my shed and was wondering if it is better to get a 400 big bore kit or to get my stock cylinders ported. Which makes more hp? Which is more reliable? Would I need bgger carbs or a cool head? Would I have to run race gas? These are all things I would Like to know thanks

Do you have to run race gas or can you run pump gas?

I have a shaved head, t'5 pipes, cascade silencers, tors removal, k&n, and Boyesen reeds.

Ive been thinking about porting my Banshee, and if i do is there any other mods i will have to make? Will i have to re-do my jetting? I ride mostly dunes, so would the HJR dune port be the best for me? I do a little of dragging, trail riding, and a little playing around. Oh one more question does the +4 timing make a big difference? Would i have to run race gas? I have alot of questions i know but im 15 and all the money i make goes into my banshee, so i want it to be the best i can make it.