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Old 01-30-2009, 10:28 PM   #8
MyKmYk
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Join Date: May 2005
Location: Dallas
Posts: 987
My Ride: E46/E90 M3, Mini CMS
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So from what my exhuast guy has said, the problem with O2 sims is that it will cause the car to run too lean on a regular basis, causing the car the get worse mileage. Additionally, it will cause the racing cats to fail prematurely should I have cats put on. So thats not too encouraging to me.

But all these issues are just so.....!
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