i was reading someones signature, and noticed it said "intake butterfly valve removed" and was wondering what the heck a butterfly valve was doing in the intake of a diesel engine. i did some searching and one post that come up said its for warming up the cold engine(makes the engine strain and heat up faster) and another post (only 2 search results come up) told me the valve was for raising EGT's for regens. so which one is right if not both, and are there any other factory or aftermarket uses for this valve? just curious.
4320Diesel
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