2002 4cylinder header confusion

According to my muffler shop I've got the wrong header and now confused . I ordered a Doug Thorley "shortie" style header from LCE part # 1046095 and was what the tech @ LCE recommended . This is for inline cats like I've got as the only other version is a split collector for dual cats

The info for the header #1046095 says for non EGR , I brought the header with me to my muffler shop and he says yes you've got inline cats but you've got a fitting off of the down pipe ,he says is EGR . He also mentioned 3 bolt ......... I dunno ?????

I called up Doug Thorley and talked to a tech and he told me yes for inline cats non EGR , I thought Calif required EGR as it was bought from a Toyota dealer here in Socal

The tech at Doug Thorley mentioned he doesn't have any in stock until late May but gave me part #'s from Amazon #TAY -511-C and from Summit # DTE -511-C . Both of those say non EGR !!!!

I'm getting confused , Help !!!!

 

Anyone ????

 

Egr comes off the header itself not the downpipe. but honestly my truck isnt a Cali one so maybe its different.

 

Thanks !!!

I called Doug Thorley again and yes that header is what is designed for my Calif emissions 2.7 4 cyl and for inline cats . But if it is the correct header what do I do for the EGR tube to keep it Calif legal ??? . Anyone modify the header to accept the EGR ??

Any Calif members running this header have any insight ??? , does the Doug Thorley header have a flange mount or pipe thread to mount the EGR tube ?? . What about disconnecting the EGR all together does this allow any driveability issues or turn on the CEL

 

If you're in California you need a header with EGR. I ran the LCE header on my 1996 Tacoma, and it fit the factory EGR system flawlessly. you can see the hookup at the rear runner on the left.



It was smog legal in California for it's year, but I'm not sure about your year. I believe the DT's are all smog legal which may be why they recommended it. In my opinion, the LCE is the superior product, and I run one on my 2012. Even though it isn't smog legal, all of the smog equipment (air injection system) fits like a glove and operates perfectly.

 

This is where it gets confusing , I've got dual inline cats in the stock location on my 02 2.7 3RZ 4 cylinder and the tech at Doug Thorley said the only header available for my application is #THY -511-C and this is listed with no EGR provision

Now the other header from Doug Thorley #THY - 511Y-1-C is a dual outlet or Tri Y design

That Tri Y header will work as it has EGR provision but the dual outlet may be a problem on smog inspection here in calif especially since I've got dual inline cats

I'm confused , all I want is a header for my truck

 

The header guys are supposed to know. That's their job to sell you what works. It would be a good idea for you to take some decent clear pictures, send them to LCE, and let them figure out what to sell you what will work.

I only know that when I got the LCE for my 1996 2RZ, the tubes were so long they totally eliminated the dual inlet down tube, and the collector bolted up directly onto the cat pipe with no cutting or welding. The fit was as good or better than the stock exhaust manifold and down tube.

 

Just got done contacting LCE Tech dept about the header for my 02 2.7 3RZ 4cyl . after giving him all my info including it being a Calif emissions vehicle with dual inline cats guess what he recommended

He told me the header I need is Doug Thorley # THY-511-C , yes the header for non EGR equipped engines ............ WTF !!!! , I want this to be Calif smog legal


If I were to use the #THY - 511Y -1C dual outlet TRI Y Header I wouldn't have any room to connect to the inline cats as they're very close to the stock down pipe . I would have to move the cats back at least a foot or more so it would fit and that would also require relocating and lengthening the wiring for the O2 sensors

 

Contacted LCE once again and the tech dept wants me to send pics to them of the manifold , down pipe and cat location . They say that I shouldn't have EGR and if I do I've got a Unicorn LOL!!

When they receive the pics he will show their fab shop and see if they can figure it out . I asked once again about the dual flange Tri Y Header and they said that this is not for my application

 

I do believe there was an EGR on the late 3RZ engines. Not sure how it operates but seeing that you mentioned smog inspection I'm guessing California so I would definitely be looking at how to get that bad boy installed. As for the cats the 4cyl has 2 but the trailing or last cat is more or less a clean-up cat/resonator. It's typically unmonitored by the ECM.

If this was a 2TR-FE I could be more helpful there. Also for those reading the valve on the manifold on a 2TR-FE is for the air injection system not a form of EGR. It only operates at start up to increase exhaust gas Temps to get the cats working faster.

 

Spent some time today looking at the exh manifold on my truck . I can't find any EGR provision from the exh manifold . All I see is a O2 sensor on the down pipe ??

I thought being a Calif emissions vehicle that it would have EGR , I guess the Doug Thorley header without EGR is what I need . I did take a couple pics and sent them to LCE so they can confirm which header I need

 

You should have a similar hook up as mine. Take a look at my build page link and see if it looks similar to what you have and I think I could help some. I did not get the Doug Thorley, I just got the long tube and the entire replacement exhaust. I am happy with the purchase.