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Old 03-28-2005, 12:20 AM   #1
Scooby Newbie
Member#: 43606
Join Date: Sep 2003
Chapter/Region: MWSOC
Location: Mansfield, OH
2002 WRX

Default Some general questions about A/F

When I got my car tuned, my tuner put a W/B sensor at the end of my muffler for the A/F reading. My exhaust setup: non-catted uppipe, one high flow cat in the downpipe. My question is, does the cat affect the A/F reading? How different would it be if lets say I went catless? I would think that the A/F reading would be off due to the cat burning off unspent fuel. I was just curious. Thanks.
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