Coal Rolling = Posing
Join Date: Nov 2007
Location: Cumberland Furnace, TN
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The red line comes from the electronic gizmo on the spider that helps the PCM control boost levels on a stock truck. Can't remember the name of it right now...
Anyway, on a tuned truck boost is going to go to whatever the tuner set as a "limit" (usually no limit) before the PCM starts trying to control it.
However, unless you've installed something like Dieselsite's wastegate actuator, or taken yours off and chopped the rod to prevent any movement, than backpressure is still gonna push the gate open from the "bottom" and you'll lose pressure that way.
The red line is an assist. It won't hurt a thing to remove it. I don't have the red line, the green line, or the electronic wastegate assist anywhere on my truck.
But I wouldn't really expect removing it do much other than neaten up the engine bay.