Headers revisited

[chiplee]

I found the old threads about JBA headers not fitting, but URD has a listing for Thorley headers that fit 2007+ 4Runners.


Doubt if any would go to that trouble and not post about it, but it's worth a shot. Has anyone here purchased these headers, and does anyone know if the exhaust manifold bolt pattern on the newer 4.7s is different from the older ones?

Basically what would make it 2007+, vice 2006+? I thought they both had the new VVTi engines.

Here's a look http://www.urdusa.com/product_info.php?products_id=1260518761

http://www.urdusa.com/images/500PICT0026.JPG

[AlexJet]

I have JBA headers on mine.

[chiplee]

I have JBA headers on mine.

Great, what year? What made it fit? How much body lift? Any need for Steering mods? Any gains noted? How was the install?

Link to where to reported on it would be great.

[AlexJet]

Great, what year? What made it fit? How much body lift? Any need for Steering mods? Any gains noted? How was the install?

Link to where to reported on it would be great.

I'm still working on the sort of write-up. The part# is: 2035S. No modification needed, it fit perfectly. Install was a little bit tricky as you need to remove the old headers, cut the top portion, install them back, put JBA in, tack-weld, remove everything tap the holes (JBA's are 1.5" and you stock manifolds are 1" or something like that), wled everything, install all back.
Headers, Y-pipe, eliminating 2 cats, Gibson exhaust, Hi-Flow Magnaflow cat gave me a good gain in performance and economy. 1.5-2 l/100km in fuel consumption and roughly 30-35 hp, but I didn't done the dyno. It feels like I have 50+, but being optimistic I think its around 35.

[chiplee]

I'm still working on the sort of write-up. The part# is: 2035S. No modification needed, it fit perfectly. Install was a little bit tricky as you need to remove the old headers, cut the top portion, install them back, put JBA in, tack-weld, remove everything tap the holes (JBA's are 1.5" and you stock manifolds are 1" or something like that), wled everything, install all back.
Headers, Y-pipe, eliminating 2 cats, Gibson exhaust, Hi-Flow Magnaflow cat gave me a good gain in performance and economy. 1.5-2 l/100km in fuel consumption and roughly 30-35 hp, but I didn't done the dyno. It feels like I have 50+, but being optimistic I think its around 35.


Well that's good news for your V6. I don't know what it means for me with an '04 V8, but it'll help figure it out if you do manage to put together some details

I really would like to read a detailed write up with pictures if you have time. Not sure I follow the "cut top portion, tack weld, put your left foot in, put your left foot out, procedure so far.

I'm planning to make these part of a build I'm doing that will involve pulling the engine. Stronger rods, lower compression, intake, exhaust, water/meth injection, and of course, the TRD blower.

[bulldog]

Headers on the V8 will be a challenge. The V6 is 60 degree block and the V8 is a 90 degree block. Thus the V8 has a lot less space between the heads and the frame rails.

[4x4v8]

Has anyone gotten a exhaust manifold for the V8?

[csteege]

I too will find out how difficult this install is this weekend as I'm planning on installing the Doug Thorley Headers on my 08 V8 according to that URD source it should bolt right up with no mods... we will see... I will try and post some pics of this and the TRD exhaust.

[csteege]

DON"T FIT!!!

I have emailed Underdog Racing to inform them that these headers do not fit. ON my 08 4runner I have pre-cats attached to the existing manifolds. I'm sure the headers will bolt up to the heads but you would have to create/make a pre-cat delete pipe and get attach new bungs for the 02 sensors (maybe a 90 bend or spacer to get the 02 out of the exhaust stream) to prevent a CEL. I'm not sure if I'm going to try and fab something up or just send them back?

[Mikestang]

You can just drill a hole and weld a bung on to the new headers for the O2 sensor. The precats aren't really needed, you will still pass smog without them. Precats are for cold start emissions. I went from 6 cats to two on my mustang and still pass the sniffer test every two years (although technically I should fail visual but as long as the inspectors see cats they're generally satisfied). The sensor cannot be out of "the stream" as you state, however, it won't work correctly, it needs to be directly in there.

http://www.mikestang.com/294906a0.jpg

[csteege]

You can just drill a hole and weld a bung on to the new headers for the O2 sensor. The precats aren't really needed, you will still pass smog without them. Precats are for cold start emissions. I went from 6 cats to two on my mustang and still pass the sniffer test every two years (although technically I should fail visual but as long as the inspectors see cats they're generally satisfied). The sensor cannot be out of "the stream" as you state, however, it won't work correctly, it needs to be directly in there.

http://www.mikestang.com/294906a0.jpg

I'm aware that I can drill the new header and weld a bung on to the headers. The hard part of this mod is going to be to build a pipe that goes from the new headers to the remaining exhaust (the distance of the oem cats). I'm more than happy to delete the 2 cats. I have some exhaust flanges but just need to start fabbing up the correct pipe 8"'s long or so but with the correct bends could be tough.

On my 02 M3 I deleted the two precats and to avoid a CEL I spaced the o2 sensor out of the stream with no CEL. From my experience as long as the o2 sensor gets hot fast no CEL

oh and good work getting rid of 4 cats such a great mod, what the hell is the government trying to do to our cars? Sounds like slow them way the hell down and restrict the hell out of them. A good qualtity hi flow cat is just as good as 3 as far as emmisions goes?
.

[Ruffian]

Wow, well it's great to see I'm not the only one who is doing research on this. Both my Tundra buddy & I are working on these kinds of mods for our Toyotas. All that we've done so far is cut out the stock muffler and put a straight pipe out. Well, I cut out my back resonator too. It's amazing by just doing that alone the pick up I have now. I can't imagine what it's like after you have gone all the way up to the headers! Adding to my list...lol...thanks guys.

[csteege]

Lastly to use these headers you would have to have an extra set of flanges from Tundra. This fab ed pipe would have to go from around 2.5" 's in diameter to 2" 's in diameter. what a pain! I love how the URD site says they work no problem :guns:

[medic83]

I'm still working on the sort of write-up. The part# is: 2035S. No modification needed, it fit perfectly. Install was a little bit tricky as you need to remove the old headers, cut the top portion, install them back, put JBA in, tack-weld, remove everything tap the holes (JBA's are 1.5" and you stock manifolds are 1" or something like that), wled everything, install all back.
Headers, Y-pipe, eliminating 2 cats, Gibson exhaust, Hi-Flow Magnaflow cat gave me a good gain in performance and economy. 1.5-2 l/100km in fuel consumption and roughly 30-35 hp, but I didn't done the dyno. It feels like I have 50+, but being optimistic I think its around 35.

I live in CA...I believe we have 3 cats on the V6... I have Magnaflow exhaust that stops as it gos over the frame, so no rear resonator. If I were to do this mod, would It be CA legal??

[Mikestang]

If I were to do this mod, would It be CA legal??

I went from 6 cats to two on my mustang and still pass the sniffer test every two years (although technically I should fail visual but as long as the inspectors see cats they're generally satisfied).

Not CA legal by the books, but you should still pass.

[Cruiserhead]

What does the V8's stock manifold look like?

the V6's is a log style so aftermarket headers would be a good upgrade. It might not be worth the effort on the v8

any overheating engine bay issues? aftermarket headers have been a problem in Land Cruisers

[csteege]

What does the V8's stock manifold look like?

the V6's is a log style so aftermarket headers would be a good upgrade. It might not be worth the effort on the v8

any overheating engine bay issues? aftermarket headers have been a problem in Land Cruisers

I posted a picture of the stock manifolds scroll up

[AlexJet]

I live in CA...I believe we have 3 cats on the V6... I have Magnaflow exhaust that stops as it gos over the frame, so no rear resonator. If I were to do this mod, would It be CA legal??

4 cats for V6, 2 on each side. Doing short headers will not bang you off the law.

[Photog]

I posted a picture of the stock manifolds scroll up

I must say: Your post #9 & #13 don't show what the stock manifold looks like, unless that nice set of headers is the factoy set.
http://www.toyota120.com/forum/attachment.php?attachmentid=1135&stc=1&thumb=1&d=1238443692

[medic83]

4 cats for V6, 2 on each side. Doing short headers will not bang you off the law.

Crazy!! thought there was 3.... So u really got that much power from it huh.... U get it dyno'd or plan on it at all

[AlexJet]

Crazy!! thought there was 3.... So u really got that much power from it huh.... U get it dyno'd or plan on it at all

No dyno results, but after making my all custom exhaust with hi-flow cats I got some ponnies out. My seat dyno showing noticible boost :rotflmao:

[csteege]

I must say: Your post #9 & #13 don't show what the stock manifold looks like, unless that nice set of headers is the factoy set.
http://www.toyota120.com/forum/attachment.php?attachmentid=1135&stc=1&thumb=1&d=1238443692

#9, that picture is part of the manifold showing that the cats are welded to the stock manifold. It's hard to take a picture of the manifold while bolted to the engine. But I think the pictures shows my point well...

[Photog]

#9, that picture is part of the manifold showing that the cats are welded to the stock manifold. It's hard to take a picture of the manifold while bolted to the engine. But I think the pictures shows my point well...

Re-read post #16 from Cruiserhead, and your reply in post #17. That picture in #9 is not an answer to his question. That is my point.

It may not be posssible to get a photo of the manifold, in the vehicle. That's OK.

I was also interested in what the V8 stock header, looked like. I have a V6, and have how the V8 header is built.


Make sense? Sometimes i don't type so well.:(

[csteege]

Re-read post #16 from Cruiserhead, and your reply in post #17. That picture in #9 is not an answer to his question. That is my point.

It may not be posssible to get a photo of the manifold, in the vehicle. That's OK.

I was also interested in what the V8 stock header, looked like. I have a V6, and have how the V8 header is built.


Make sense? Sometimes i don't type so well.:(


Hmmm, yeah you lost me with this "V8 stock header, looked like" there's no such thing as a stock v8 header on our trucks it's called a manifold.

and I don't understand this "have a V6, and have how the V8 header is built.

"?

[Photog]

Hmmm, yeah you lost me with this "V8 stock header, looked like" there's no such thing as a stock v8 header on our trucks it's called a manifold.

and I don't understand this "have a V6, and have how the V8 header is built.

"?

Yep, I didn't type so well, again. I meant to say: " I have no idea how the V8 header is built".

You are correct about the terminology between header & manifold, depending on how they are constructed. A "log" type, would commonly be called a "exhaust manifold", where as separate tubes would be called "exhaust headers".

Side note: An internet search for images of the factory exhaust manifold turned up nothing.

[csteege]

I have to say it was quite the job but after 4 cuts or so the URD Y pipe for the 4X4 Tacoma fits a V8 4th gen 4Runner. If you have some welding experience it's not that bad 3 hours...

[bulldog]

I have to say it was quite the job but after 4 cuts or so the URD Y pipe for the 4X4 Tacoma fits a V8 4th gen 4Runner. If you have some welding experience it's not that bad 3 hours...
Do you have the 03-04 V8 or the VVTi with the 4cat system of the 05+ V8?

Why did you go for the Tacoma vs the FJC Y pipe?

[csteege]

Do you have the 03-04 V8 or the VVTi with the 4cat system of the 05+ V8?

Why did you go for the Tacoma vs the FJC Y pipe?

I have the 08 and I went with the Taco vs the FJ because URD is backordered on the FJ and would take about the same amount of cuts IMO...

[Mikestang]

I have to say it was quite the job but after 4 cuts or so the URD Y pipe for the 4X4 Tacoma fits a V8 4th gen 4Runner. If you have some welding experience it's not that bad 3 hours...

Looks great, but not a viable mod here in CA as we have 2 cats up there that would be removed by this mod. Some day I'll be replacing just the Y junction on my exhaust, but maintaining all the cats.

[csteege]

Looks great, but not a viable mod here in CA as we have 2 cats up there that would be removed by this mod. Some day I'll be replacing just the Y junction on my exhaust, but maintaining all the cats.

A very viable mod I had 4 cats too now I have only two and is the reason I did the mod? It will still pass a sniff test maybe not a visual though?

[1rook]

There is the possibility of a group buy for V8 headers to be built up for v8 4Runners.

http://www.yotatech.com/f117/doug-thorley-header-update-07-08-09-a-186155/

http://www.yotatech.com/f117/headers-2004-4runner-184620/

[expat]

Thanks for posting 1rook. I've asked questions on the two threads. Look forward to his reply.

[BoOZ nG]

has anyone in the SoCal area installed shorty headers on their v6? it would be great to take a look at before i even take a chance at buying and installing it myself.