I am on the fence still about going to a KO4, but if I did it would most likely be the APR OEM kit with their downpipe since I already have their intake, ECU and TCU software. Their IC is even pricier than Neuspeed but on par with IE's.
Is there a quick answer to the question of stock location vs. front-mounted?
I know that despite my desire to stay stage 2, I'll eventually go BT. Arm + WMI is plenty for a street setup probably even light track duty.
Fmic have their pros and cons.
Better air flow, better positioning. I never understood the sandwich setup on VWs especially coming from a Evo X before this. However from my understanding the radiator still receives less flow even with the stock ic removed when running a fmic. Core size is also limited.
I'm assuming that since you live in LA you see a fair amount of stop and go traffic. So I'd say a larger stock location, especially with your potential K04 plans.
I'm sure someone more knowledgeable on the subject than me will chime in.