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There are 5 listings for the EGR tube on RockAuto.Well, let's think about this. Are there any sensors behind the split flange on a Vortec? Why yes there are. So, does your cat back system have a place to transfer B2 downstream O2 sensor?
Shorty headers are a decent upgrade over restrictive manifolds, but be aware of the need for proper EGR plumbing on the driver side. The tube is NLA.
He must be thinking of the 454 tube which is truly NLA. Then again it is the same size as a natural gas supply pipe for a furnace or water heater and a trip to Lowes/Home Depot/ACE Hardware, etc will easily provide a replecement.There are 5 listings for the EGR tube on RockAuto.