Ive seen several different placements and I just want to know whats the best placement. Ive seen the normal placement on the charge pipe a foot or so from the tb, right before the cooler on the cold side or the hot side of the intercooler(backdoor style)

 

ideally, you want it close to the TB, but it doesnt really matter much. Just make sure you have a good vacuum source.

 

where the vacuum line is the shortest