A second OEM IC is more than enough surface area for a K03/K03s. The bigger IC= pressure loss, even though they save pwr to heat soak. Most manufacturers that do big turbo kits, do a FMIC w/ them....ever noticed they arent real big?!
My FMIC on the jetta gained 2 lbs of boost due to better piping that was also shorter, and more efficency. I am the 1 in a million.