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Old 09-02-2008, 10:52 PM   #27
FullMetal_Focus
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Join Date: Jul 2008
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Location: Valley Village, CA
What I Drive: 2012 Silver Mazdaspeed 3

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Yeah I think the PZEV reuses some of the exhaust gas, more so than most EGR valve systems, too achieve the low emissions. Not sure though. But I guess that can be whiped out with a ECU tune that disables the EGR valve, like the FocusSport ECU tunes.
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