Will I need new jets?

I'm going to get new jets for my KZ 650, as I'm running pods and plan to do a 4 into 1 kerker exhaust. Right now, I've got a stock exhaust, but will upgrade to the kerker probably within a year or so. Should I account for the exhaust in my measurements of what size jets i need?

Right now, I'm thinking 115 mains and 17.5 pilot jets. If I go to the 4 into 1 later would I need to upgrade again, and would it be prudent to upgrade now so I don't need to later? Basically, is it worth it to put the size I would need for the 4 into 1 on now, or should I get those jets when I can get the new exhaust?

Thanks!

I bought these jets, but how far should the pilot jet be screwed in?