EvilErnie95 Posted February 21, 2007 Share Posted February 21, 2007 Removed my cat as its not required here but now my idle when cold shoots up to 1100 for a long time. Is this a coincidence? or are there other reasons for this? Seems to have a little more umph but not a huge help. Link to comment Share on other sites More sharing options...
Kn0xville Posted February 21, 2007 Share Posted February 21, 2007 i think you need the cat for the correct back pressure. but i could be wrong. Link to comment Share on other sites More sharing options...
sammyb33 Posted February 22, 2007 Share Posted February 22, 2007 i dont think you need the cat for correct back pressure....what are people gaining by puttin on a "free flowing exhaust"!!!!!!!! Link to comment Share on other sites More sharing options...
unccpathfinder Posted February 22, 2007 Share Posted February 22, 2007 my normal idle on a cold day (40 F and below) is like 2-2.5k then once warm it drops off to normal .5k...i dont know what affect this might have on the O2 and/or it could affect idle but maybe the ecu needs to be reset... Link to comment Share on other sites More sharing options...
GrimGreg Posted February 22, 2007 Share Posted February 22, 2007 A high flow cat still creates some back pressure. Link to comment Share on other sites More sharing options...
unccpathfinder Posted February 22, 2007 Share Posted February 22, 2007 i know running straight headers is bad...but my 87 that i completed the 95 swap on...my test drive (see below) and some other drives were with nothing but headers and i didnt notice anything abnormal and there should be like 0 back pressure i know it would be bad for the engine over time but i didnt see rpm changes that were out of the blue from my DD 95...she was just loud as hell Link to comment Share on other sites More sharing options...
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