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Old 10-13-2021, 10:23 AM #16
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Quote:
Originally Posted by Jakeepoo3 View Post
That forest looks so fun! Pick up trash if you see any. That's how I contribute to the problem. That will have a much greater affect on nature than a straight pipe!
Definitely clean up what you see... Absolutely.

But, I don't want to smell anyone's exhaust out in the woods, on the trail, or around the campsite either.
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Old 10-13-2021, 08:02 PM #17
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Originally Posted by JONBOY345 View Post
Definitely clean up what you see... Absolutely.

But, I don't want to smell anyone's exhaust out in the woods, on the trail, or around the campsite either.
Me either that's why I always go solo. I think after your project is complete and TUNED you'll know what fully combusted gas is. Most Exhaust pollution is caused by ignorant people that don't understand combustion and organic chemistry including the mechanics they trust. This bring me back to my college days. Here is the real science, all you need to know. Fully combusted. Fuel (CxHy) + oxygen (O2) + spark>water (H2O) + carbon dioxide (CO2) + heat. The product compounds are odorless. 😽 Let's put catalytic converters composing of rare earth metals on greenhouses too, tearing up the earth some more.
Tell your friends and help the problem at it's root source. No more myths to pass along.
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Old 10-14-2021, 09:55 AM #18
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Originally Posted by Jakeepoo3 View Post
Me either that's why I always go solo. I think after your project is complete and TUNED you'll know what fully combusted gas is. Most Exhaust pollution is caused by ignorant people that don't understand combustion and organic chemistry including the mechanics they trust. This bring me back to my college days. Here is the real science, all you need to know. Fully combusted. Fuel (CxHy) + oxygen (O2) + spark>water (H2O) + carbon dioxide (CO2) + heat. The product compounds are odorless. �� Let's put catalytic converters composing of rare earth metals on greenhouses too, tearing up the earth some more.
Tell your friends and help the problem at it's root source. No more myths to pass along.
What do you mean by tuned? Other than OrangeVirus, I don't know of anyone offering real tuning for these trucks... And even then, OrangeVirus is just in beta at the moment.
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Old 10-14-2021, 09:09 PM #19
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Originally Posted by JONBOY345 View Post
What do you mean by tuned? Other than OrangeVirus, I don't know of anyone offering real tuning for these trucks... And even then, OrangeVirus is just in beta at the moment.
There are a hundred different variables involved. The only two things that matter for tuning are timing and a/f ratio. Modern scanner like the SCT Raptor and an ACCURATE, REPEATABLE & CONSISTENT AIR FUEL RATIO DEVICE. More expensive Horiba, ECM or Powertrain Dynamics Dyno sensors are required. I'm sure you can find a good Dyno tune shop.
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Old 10-15-2021, 07:59 PM #20
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Quote:
Originally Posted by Jakeepoo3 View Post
There are a hundred different variables involved. The only two things that matter for tuning are timing and a/f ratio. Modern scanner like the SCT Raptor and an ACCURATE, REPEATABLE & CONSISTENT AIR FUEL RATIO DEVICE. More expensive Horiba, ECM or Powertrain Dynamics Dyno sensors are required. I'm sure you can find a good Dyno tune shop.
That's great, is there a specific manufacturer you'd recommend for a tuning device for the 4.7L V8?
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Old 10-17-2021, 06:06 PM #21
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Quote:
Originally Posted by JONBOY345 View Post
Sorry, I didn't mean 'meh' from you... 'Meh' info in some of the replies from others.

I initially went to Shorties from OEM (long story, but it was due to fabrication issues that I got rid of the shorties and went to LTs), and noticed it was actually quieter than the OEM manifolds.

But, I've also got the Vibrant Ultra Quiet resonator to help with the drone.

Here's a quick cold start video from right after I got it all back together: 09 4Runner V8 Long Tubes + Magnaflow Catback.

It's a tad louder/more droney in the cabin than before due to deleting the resonators in the DT y-pipe, but it's tolerable. The worst part is the drone. Nice low rumble at idle, mellow tone while driving around normally, but really opens up when you get on it.
So, to recap...

I'm looking at DT Long Tube headers with a DT y-pipe. I'll need 2 cats (looking at magnaflow 54956) to replace the resonators in the y-pipe by cutting & welding. After that I'll need O2 bung plugs & O2 bungs to weld downstream of the cats on the y-pipe.

Sounds right?
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Old 10-17-2021, 07:26 PM #22
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Originally Posted by dcraddo03 View Post
Currently have a CEL for low catalyst efficiency. I figured I'd go ahead and replace my cracked manifolds while I'm doing exhaust work, so I started looking back into a pair of Doug Thorley headers, which are something I've had my eye on for a long time.

I want to keep catalytic converters on both sides -- I really really don't want my truck to smell. I'm also a little unfamiliar with the exhaust system layout for my model 4Runner and can't find a helpful diagram. Will the long tube headers bolt straight to the cats (assuming I get direct-fit cats from Magnaflow or somewhere else), then the cats to the y-pipe? If not, how can I fit 2 cats into my exhaust system? Should I go for the short headers and weld universal cats to the headers?

I suppose I can run an O2 Simulator if I need to, but I won't run without any cats.


I had my RHS exhaust manifold replaced a couple weeks ago. After looking at all the options including the DT headers (hard to find, but still available in a coupla places), and in consultation with my mechanic, I just decided to get a normal genuine Toyota manifold/cat. It took about 110k miles for mine to crack, so if I get another 110k before I have to replace that one, it's not too terrible.

The mechanic asked me what I like best about the V8. I said, for sure it's the huge amount of torque available at very low rpms, like 1-2k (even on the highway, I rarely if ever see 3k rpm). He said, then stick with the OE part because while the headers would surely be more free-flowing and ultimately increase peak torque and hp, they will most likely shift the torque curve to the right. So you'd get more torque but higher up. Impossible to tell how much without a dyno, but point taken.

At any rate, the car is soooooo much quieter now, especially on startup.

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Old 10-18-2021, 02:07 AM #23
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Quote:
Originally Posted by 2003V8LTD View Post
I had my RHS exhaust header replaced a couple weeks ago. After looking at all the options including the DT headers (hard to find, but still available in a coupla places), and in consultation with my mechanic, I just decided to get a normal genuine Toyota manifold/cat. It took about 110k miles for mine to crack, so if I get another 110k before I have to replace that one, it's not too terrible.

The mechanic asked me what I like best about the V8. I said, for sure it's the huge amount of torque available at very low rpms, like 1-2k (even on the highway, I rarely if ever see 3k rpm). He said, then stick with the OE part because while the headers would surely be more free-flowing and ultimately increase peak torque and hp, they will most likely shift the torque curve to the right. So you'd get more torque but higher up. Impossible to tell how much without a dyno, but point taken.

At any rate, the car is soooooo much quieter now, especially on startup.
I'm sure your mechanic is right. From what I've been reading, the short tube headers = +++low-end torque. The long tubes = +++peak power (shifting the curve to the right).

With that being said, OEM parts are more expensive than they should be. I'd rather drop what I have saved on parts that won't crack, will sound better, and will ultimately save a little $$ with some extra mpg.

I understand that my 4Runner is no race machine.. I do use it to tow but it's got an excess of low-end torque that I rarely use, so I'm willing to give that up for the LT headers.
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Old 10-18-2021, 09:17 AM #24
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So, to recap...

I'm looking at DT Long Tube headers with a DT y-pipe. I'll need 2 cats (looking at magnaflow 54956) to replace the resonators in the y-pipe by cutting & welding. After that I'll need O2 bung plugs & O2 bungs to weld downstream of the cats on the y-pipe.

Sounds right?
Yup. Here's what I used:

Plug: https://www.summitracing.com/parts/stw-o2p
O2 Bung: https://www.summitracing.com/parts/kok-9002s-c
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Old 11-26-2021, 10:50 PM #25
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Has anyone accomplished a true dual exhaust on a 2020 5th gen 4Runner?
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