Kawasaki ZX6RJ ZX-6R ZX6 R ZX600R 636 cc Ninja Carburetor Carb Stage 1-3 Jet Kit | eBay

I'm really just wondering if this kit is a good way to go about upping the Jet sizes. My mechanic buddy told me to go to JetsRUS.com and get the jets individually a few sizes bigger. Im new to working on motorcycles and this seems to have everything I need as far as I'm aware. I'm also putting a new K&N airfilter in the air box and I have a new Dominator slip on, the new exhaust is the whole reason I'm upping the Jet sizes.