Elkaholic

Ok Im gonna stay outta the EGR talk because I am confusing the heck outta myself and I dont wanna give any false information. I cant get it figured out LOL

the_gunslinger

it's definately an 02 sensor. one on the y-pipe & one after the cat. they're electrical. there's no 'tube'

QSVeilside

Gunslinger-

Check one more spot for me please. Look for this tube on the DRIVER's side exhaust manifold:

the_gunslinger

thats not there, either. looks like i don't have an EGR. I feel speshul

QSVeilside

Got it. I'll make the correction to the CT list.

Just goes to show guys you need to physically check to see whether or not EGR is present and how many cats you have under the truck.

the_gunslinger

thanks for the help, QS.

QSVeilside

No sweat gunslinger. Sorry for the confusion!

daytraitors

I'll sign up for the ceramic at the 20 person price! -d

Elkaholic

Hey Q, is that pic you posted from the TRD Supercharger installation instructions?? Cuz I have been looking for that pic lol

QSVeilside

Yes sir.

http://www.customtacos.com/tech/index.php?article=45

patrickryanb

How do you explain, "if i dont have these, my truck wont run"? or i could always use the excuse, "im sure we will get better gas milage from this". haha i wish i had the cash to jump on board!

Elkaholic

Tryin to convince the wife eh???

kevin444

if your still lost take a pic of your exhuast mani's on the driver side up to the firewall, and will give you the answer = )

Elkaholic

Oh no I know I dont have an egr truck. I looked, Im just getting confused on different trucks and what exactly each truck will have if it is egr.

I guess what Im getting confused about is this....And kevin I have the same setup as you so you know what Im talking about.

From my understanding the only parts that have to do with the EGR is the part shown in one of the pics above on the drivers side header correct?

So on the stock exhaust there are the two cats and the two sensors. The first A/F sensor before the first cat, Is that going to end up going into the bung at the bottem of Thorley headers? That bung is just replacing the stock one correct?

Refer to my horrible artwork below?





Do yuo get what I am asking? I just cant for the life of me get this straight

QSVeilside

Elkaholic:

I could not understand why there is such confusion going on until holy moly... I realized that I posted the wrong picture above. My apologies for the confusion. This is the EGR model - you can see the extension bung present on the drivers side:

QSVeilside

Confirmation of Elkaholic's statement above.

Once again, my apologies for the confusion guys.

Speedy

Correct. I asked the Thorley guy this exact question. The flange and a few inches of pipe get cut from the CAT pipe and the Thorley flange welded on. Then the AFR sensor goes into the bung on the Thorley header down pipe.

Speedy

Can anyone get this thread to come up in a search? I can't, and find it bizarre.

kevin444

yeah that is correct guys. However i dont understand why thorley used a 2 bolt exhuast flange after the collector and 1st afr sensor. Im starting to realize that the flange is pretty hard to get because It was hard for me because i wanted to make a custom down pipe to delete the 1st cat. If it was 3 bolt it woould totally be a completeley boltable solution.

Elkaholic

Ok thanks for confirming guys. ya Q I thought you had the wrong pic up but wasnt sure about it.

So my next question about what Speedy posted. Since there isnt much pipe between the stock sensor and cat the new Thorley flange is going to weld up pretty much directly to the cat huh?

And if thats so why is the flange there? For the cat delete, and so they could use the same downpipe for both egr and non egr???