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Old 05-11-2012, 12:39 AM   #10 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
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Pasta - '96 Volkswagen Passat TDi
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The intake coolant line is there to provide warmth to the intake air and prevent sonic freeze at high air velocities. It doesn't do much, but removing it creates a traceable increase in power when tuning. At least it did on my Civic, 3hp avg over 5 runs on a chassis dyno at 3k rpm. I never had a problem with sonic freeze, either.
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