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Old 01-15-2013, 05:12 PM
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drivinfaster drivinfaster is offline
bimmerfest Supporting Member
Location: in the sticks you piney
Join Date: Nov 2007
Posts: 11,753
Mein Auto: rescued bmw's
no, cats reduce co, hc, and nox. the nox is reduced first, then the hc and co.

cats can be checked for o2 retention as well as co reduction.

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