Its pretty obvious that the answer will be yes but here goes:

If I upgrade my stock brakes lines to Stainless and then in the future want to go to a big brake bit with larger calipers- I will have to buy new brake lines then as well, correct?

Basically, each brake setup usually has its own brake line size, right?

Thanks-

 

If you get stock replacement SS lines, then upgrade to a BBK with whatever calipers, you do NOT have to replace the lines...

All you need is the correct brake line adapter, that will accept a banjo bolt (a banjo bolt is used to hook up the stock line to the stock caliper).

I am using stock replacment SS lines on my Wilwoods