i have a 07 wrx and am wanting to do a turbo upgrade. It is catless stage 2 right now with the cobb map. should i dish out the extra money for the 16g or should i just get a vf? i can get one from my girlfriends neighbor once he swaps his turbo in his 07 sti. I just want the most cost effective and reliable turbo, that will give me good power.