might help if you put where your from? doubt someone who lives in london is going to be willing to drive up to scotland to fit a fmic.
as for dv location 6 & 2x3 to me
supposidly cold side (front of engine) is better, and i can see the reasoning, after all its colder air thats going to be put back into the engine. but never seen any figures to support this. and imo i think having a massive pipe from front to back of engine is just ugly so id fit at back.