confirmation on factory exhaust pre-cats

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confirmation on factory exhaust pre-cats

July 15, 2013, 09:56:54 AM

pls confirm if there is anytthing at all inside the precats

the last time i brought this up it was 50/50 who said yes there is an obstruction inside the pre-cats.

on my old 3.8L, my 5.8L and my 5.0L, after gutting the CAT, i ran a wire up inside the exhaust and ran into no obstruction all the way up to through the header.

anyone?

confirmation on factory exhaust pre-cats

Reply #1 – July 15, 2013, 01:24:58 PM

my 88 Sport was hollow (brother said he gutted them when he had it, IDK for sure). My buddy had an 87 and there was definitely honeycomb in them. He put my Y pipe on his after I swapped to an H pipe and we sold all three cats out of his Y pipe

confirmation on factory exhaust pre-cats

Reply #2 – July 15, 2013, 11:35:33 PM

ok,, thats 1 vote for "the pre cats are full"

confirmation on factory exhaust pre-cats

Reply #3 – July 15, 2013, 11:57:04 PM

Barring outside interference, the pre-cats will be full.

confirmation on factory exhaust pre-cats

Reply #4 – July 16, 2013, 01:09:46 AM

then i guess i better double check my 20th.
my oldest boys bird sport were empty, i spoke to the previous owner last week and he said he did not gut them.
good news for me if i find them full.

confirmation on factory exhaust pre-cats

Reply #5 – July 16, 2013, 01:54:44 AM

I've been told by a ler shop that they are resignators(sp?)

master ler charged me for three cats when I told them I had to pass on my old 86 and said all three were gummed up, so i don't know.