OonDeanisS Founding Member Jun 16, 2002 902 1 19 Danbury, CT May 20, 2012 #1 May 20, 2012 #1 does anyone know if i get a catted h-pipe for my long tubes, do i need to install the o2 sensors before or after the cats? does it matter? i need them to pass emissions by the end of this month. this is for a 1990 manual 5.0. thanks
does anyone know if i get a catted h-pipe for my long tubes, do i need to install the o2 sensors before or after the cats? does it matter? i need them to pass emissions by the end of this month. this is for a 1990 manual 5.0. thanks
R reldla1996 Member May 4, 2011 356 22 19 Dayton, Ohio May 20, 2012 #2 May 20, 2012 #2 The O2 sensors should be in the collectors of the headers, which is before the cats.