Larger TB Question

Getting ready to put clutches, a slip on and FC on my 800 Outlander. The next phase of upgrades will be drop in cams and maybe have the TB bored or just get a larger TB. I know more air flow will compliment the cams but what kind of actual gains can I expect going to a 51mm TB? Is it worth going to a larger TB if you don’t go to a larger intake as well? Is there anything else that’s going to need attention when I change the cams and TB? My last question is which skid plates are best. Just kidding!