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90 350300 n hlp cat? i have owned my e35o since new its an efi with the split ehaust manifold you guys favor so much. is there one or two cats on this truck the down tubes have a short crolarge chamberssover tube and then they enter a large chamber is this a cat or some type of factory collecter. is it hollow inside is what i am really asking thanks as always paul k md.
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Joined: Sep 2007
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They're both cats. I cut mine off of my truck to replace them with a single high flow 3 way converter and they both had the honeycomb material in them. My guess is that the first one is a two way cat and the second one is to filter the nitrogen oxides that two way cats don't help with, but that's just my guess.
