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  1. Rednexus

    Best Option For Thorley Headers CEL Avoidance?

    FYI, a local scrap yard paid $585 for my used U/S cats, which paid for 2/3 of the headers. You'll also need to budget for OEM Toyota gaskets (the DT gaskets suck) and probably a few new nuts and studs.
  2. Rednexus

    Best Option For Thorley Headers CEL Avoidance?

    STs = Remove/unbolt OEM manifold and upstream cats, cut up the OEM manifold off of the upstream cats, install the ST headers, mock up and tack weld the stainless OEM cats to the stainless ST headers, remove the mocked-up units, fully weld, then re-install for good. The header nuts are very hard...
  3. Rednexus

    Best Option For Thorley Headers CEL Avoidance?

    That setup is probably similar (albeit better flowing :)) than LT headers and the OEM Y-pipe. OEM Toyota cats are supposed to be really good, so maintaining the D/S cats would seem to be similar from a smell perspective to an aftermarket/custom Y pipe with aftermarket cats.
  4. Rednexus

    Best Option For Thorley Headers CEL Avoidance?

    It's smellier that OEM for sure, as indicated above. But I never smell it while driving. If the GX is warming up in the morning and I'm loading the cargo area (either as part of being a DD or while camping), you do notice it. Not noxious, but not something I like taking a big whiff of. I would...
  5. Rednexus

    Best Option For Thorley Headers CEL Avoidance?

    If the front cats were removed for the LT headers, it will definitely throw PO420 and PO430 codes, as the downstream O2 readings will be outside of the allowable spec due to the lack of upstream cats.
  6. Rednexus

    Best Option For Thorley Headers CEL Avoidance?

    Install a 90 degree O2 spacer for each of the downstream O2 sensors. I have two like this one (previously available on Amazon but no longer) and have zero CEL's with my DT LT headers. Others have been buying the spacers from Big Daddies Garage since Amazon no longer carries them.
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