I was just wondering which one is better pre turbo or post turbo?? How much temp different would I see one vs. the other??

 

Pre-turbo is best. Choose a spot right before the manifold connects to the turbo. Preferably the side that connects cyl. 5,6. That is the hottest area. The difference you would see before and after depends on a lot of things and is different from truck to truck, setup to setup. Expect about 200* or so.

 

well put "soul" x2...on that !