you have to specifically purchase a rising rate FPR that references boost, and they're usually on a 1:1 ratio. You'll note the difference in pictures as you'll often be able to see the barbed vacuum line fitting on the side.
Boost-referenced FPR's are often WAY more expensive than a normal one, but if you're going boosted, I would recommend it.
Bottom line, make sure the description specifies "boost referenced" or "rising rate"
Picture: Aeromotive boost referenced, 30-60psi range (just an example)
