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06-27-2015, 09:23 PM
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#2 |
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2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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The one behind the throttle body pulls gasses out of the crank case at idle. The one in front recirculates the blowby from the PCV valve. In theory you don't need either--they're for environmental/emissions compliance.
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