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If you can't do pre-turbo (in the collector just before the turbo) post turbo is better than nothing. The temperature difference pre&post is a sign the the efficiency of the turbo - more back pressure across the turbo's exhaust/drive turbine means you are probably not running a very efficient...

Also, black smoke when under load indicates you are spewing unburned fuel out your exhaust (i.e., "rolling coal" is a waste of fuel). Letting off the right foot and down shifting, while not getting you up the hill as fast, will put the engine into a more comfortable load range. In my...