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Originally Posted by 9secfirebird
why dont you drop the exhaust at the cats and see if it runs any different. or you can take temperature readings before and after the cats to determine if thats the cause
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to add to that...i would take out the front 02's & see if it runs differently...on my 98 when i was doing my headers 5 of the 6 studs snapped off while trying to remove the parts your referring to...I dont think he'd like to deal with that as well...especially considering undoing the front o2 will just throw it into open loop but will do pretty much the same thing.