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Old 02-13-2009, 06:42 AM
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d0ugmac1 d0ugmac1 is offline
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2003 Altima
 
Join Date: Aug 2008
Posts: 160
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pre-cat is short for pre-catalytic converter.

Our engines have three catalytic converters. Two are integrated directly into the exhaust headers, and a third main cat roughly under the shift lever.

The pre-cats heat quickly and take care of cold engine emissions.

nissan pre-cat failure picture - Google Image Search
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