Hi, I have an 06' GX470 with about 150k miles on it. I bought it 2 years ago and after a few months of ownership and towing a race trailer, I heard that ticking we've all come to recognize. Found out there was a sizeable hole in the drivers side manifold. My father in law owns a shop and we replaced it with all Lexus parts (about $800 total for new bolts gaskets, etc.). Last spring I started to hear it from the passenger side and bought a OEM manifold ($350 total). I decided to change that side on my own and spare my father in the law the exorbitant amount of time required to change out the manifold. After removing the old one, I found the new one didn't fit due to some shoddy welds and I was livid. Given I had to be at work the next day, I put the new gasket and bolts on and used the old manifold (which was stamped 2012 so I'm assuming it was changed around then). It worked ok for a few weeks but then I got the P0430 bank 2 code, which appears to be the cat is toast on the old manifold. To top it off I'm hearing to ticking from that side again. I have a free weekend coming up and am planning to get it fixed. It sounds like a lot of people like the Doug Thorley headers. From what I've read there's a little performance benefit and also they're less prone to cracking. I found a set of the long headers but was curious if they bolt into the stock Y-pipe, or if I'd need to get a new cat back system as well? Also I saw that URD sells an 02 simulator and I was wondering if that would fix the P0430 code and pass state inspection?
Doug Thorley Headers (1 Viewer)
- Thread starter GXOutlaw
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They won't bolt into the stuck y unless you get a different cat.
Maybe....
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Those dont have the emissions pipe for the secondary air injection system. They MIGHT fit the 03-04 GX's but not 05+
- Thread starter
- #5
I they make a version for 05+ that has the extra tubing for the cooler. Either way, if I can't pass emissions with the DT manifold I'm not going to go down that route. I was thinking of using some JB weld extreme heat around the welds and changing the O2 sensor. I priced it to $50 using a Denso O2 and should only take 30 min or so. If I end up having to change the manifold, does anyone know if the 4 Runner 2uz-fe manifold for 06' fits? It's about 10% cheaper through Toyota for parts compared to buying it through Lexus.
