Doug Thorley Header Review & Post Installation Photos – 3.4L 5VZ-FE

[96RedRunner]

I dont mod N/A vehicles for power because of that. Only boost. No reason to spend more money to make the same power a cheap turbo or nitrous kit can get you.

But with his setup for that money he could have gone turbo with full EMS by now.

No doubt FI gets you there with fewer bucks. Talking Runners I like the constant boost from idle to wot with a SC more than Turbo based on usage.
The NA mods for me were class governed in autocross, you did what you could to eek out a pony or three. put me in a seat behind twin turbos w/200 shot on a stroked SB/BB thats sweet!! on the strip/street.

 

[96RedRunner]

But its a talon. Nice for commute but not offroad. .

Edit: after (re)seach talon will def rally

Yes in deed they will! They were somewhat the lead in Rally for the times.

 

[gamefreakgc]

I have a bad baseline for this summer, since CA changed their gas blend and my MPG's have gone to pieces, along with any other older vehicle.

Pre-header MPG: 14.9
Post-header MPG: 15.47

I'm not sold on these readings though, because prior to the summer blend I was getting 16.7-17.0 MPG's. When winter blend hits I'll post up the numbers again.

 

[Scramble]

I have a bad baseline for this summer, since CA changed their gas blend and my MPG's have gone to pieces, along with any other older vehicle.

Pre-header MPG: 14.9
Post-header MPG: 15.47

I'm not sold on these readings though, because prior to the summer blend I was getting 16.7-17.0 MPG's. When winter blend hits I'll post up the numbers again.

How are your MPG's now?

 

[gamefreakgc]

How are your MPG's now?

My O2 sensor fouled a few months back and I didn't realize it, was getting a constant 14.5 MPG over the winter. I started tracking it again so hopefully the numbers go back up.

Super(charged) Fun (Toyota 4Runner) | Fuelly

 

[AStraughn1]

I just purchased a set of DT Headers for my 2018 4R OFP and am trying to make sure I understand everything I need to do to SAFELY install them with no long term problems. I got the long tube headers from Doug Thorley, and per their instructions bought a URD O2 Simulator. I planned on bringing those pieces of hardware to a professional performance shop to install. I got specific instructions from the Sales Manager from Doug Thorley but I am trying to get a good gauge to know if there is anything I missed. If I install the headers, with an O2 SIM is that all I need for it to be safely installed for the long run? I had heard from a local shop (which contradicts Doug Thorley directions) that an O2 sim isn't sufficient for the long term and I need to get it tuned. Does anyone have some thoughts on all of this and give some advice as to how I should proceed?

 

[frodiesel]

I just purchased a set of DT Headers for my 2018 4R OFP and am trying to make sure I understand everything I need to do to SAFELY install them with no long term problems. I got the long tube headers from Doug Thorley, and per their instructions bought a URD O2 Simulator. I planned on bringing those pieces of hardware to a professional performance shop to install. I got specific instructions from the Sales Manager from Doug Thorley but I am trying to get a good gauge to know if there is anything I missed. If I install the headers, with an O2 SIM is that all I need for it to be safely installed for the long run? I had heard from a local shop (which contradicts Doug Thorley directions) that an O2 sim isn't sufficient for the long term and I need to get it tuned. Does anyone have some thoughts on all of this and give some advice as to how I should proceed?

This is the wrong thread, wrong year, wrong spot to post

Sent from my SM-G930P using Tapatalk

 

[SDmtnbkr]

I purchased the Doug Thorley Headers, Part #: THY-507-C .....

I noticed that you ordered the non-smog version, and are also located in CA... can you please explain? Why is there a smog version, and why did you not use it? I do see that both are CARB legal, so I'm confused.

Planning my move to a S/C and would love to know before ordering parts. I have an '02 Auto, if that matters.

 

[gamefreakgc]

I noticed that you ordered the non-smog version, and are also located in CA... can you please explain? Why is there a smog version, and why did you not use it? I do see that both are CARB legal, so I'm confused.

Planning my move to a S/C and would love to know before ordering parts. I have an '02 Auto, if that matters.

The difference is the EGR valve port which is only on a few older 4Runners. I don't have an EGR valve ('02 don't have them either) so you'll want the non-EGR valve version.

Since you have two cats, yours might actually be bolt-on and no welding required. They are still an absolute pain to install though!

 

[SDmtnbkr]

The difference is the EGR valve port which is only on a few older 4Runners. I don't have an EGR valve ('02 don't have them either) so you'll want the non-EGR valve version.

Since you have two cats, yours might actually be bolt-on and no welding required. They are still an absolute pain to install though!

Ok got it. The website I was looking at them on did not clearly explain the Smog/EGR valve option, but now it makes sense. Thanks!