Join Date: Mar 2002
Location: Austin, TX, USA
Re: thinking about gutting my cats?
From the sounds of other posters, I'd guess this is a speed-density EFI system. MAF systems aren't sensative to changes in exhaust flow since the MAF will compensate for the improved volumetric efficiency. However, OBDII systems have a pre cat and post cat O2 sensor in each bank. If the post O2 doesn't see a reduction in CO / NO2 it will throw an error as others have stated.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI