Posted by Brian Jasper co. Ia on June 25, 2009 at 18:40:39 from (67.142.130.11):
In Reply to: O/T Cat Convertor posted by IndianaRed on June 25, 2009 at 17:07:09:
It will not run worse if you removed the converters, but you will get a check engine light with codes for low catalyst efficiency, 1 for each bank. If you think you have a restricted cat, get a back pressure gauge that screws into the pre converter sensor hole. GM's spec for back pressure is a max of 1.5 psi @ 2000 rpm no load. Summit Racing Equipment used to sell a device that mimicked a good after cat signal for "off road use only". Last I knew, they didn't sell them anymore.
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