Kev, i got to work with @sle on this problem and I wanted to post a real world example because the output im getting is iffy in a real world example. Im still going to use KO and PEP.
Current Ivols
PEP/USD 1 month = 16%
KO/USD 1 month = 12%
Forecasted 1 month Cor KO/USD, PEP/USD = 70%
formula...