I have an 87' 300E with 330,000km on it. I had the exhaust manifolds off and the pre cats were gutted. At first I thought it was great but then I noticed that they were upstream of the o2 sensor. Benzmac, does the computer require these cats to be working properly for a proper fuel map? Thanks.

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Chris Muc
Auto mechanic
'87 300E 330,000 km