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Originally Posted by
GoLfMan
butterfly is there as a shut of valve for the engine I believe.
That, and it works to increase vacuum past the EGR inlet, to draw in more or less EGR. It's a restriction, pure and simple.
It is absolutely necessary to do a regen if you have a DPF - GT TDI/Passat in MKV or all MK6 TDI's.
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