Doug Thorley Long Tube Headers

[Brovo4Life]

I know it is a different car but i have a few friends that have the GTO with long tubs on them but for their tubs going to the end of their car they put in removable cats so when it comes that time for them to go to emissions they just simply go under the car and unbolt the straight pipes after the long tubes and put the cats back in. this has worked for them over the years and have been able to pass everytime with no problems so if you do end up going with the long tubs there are always ways around the system that will let you pass.

 

[moonrunner]

You can put a cat between the y-pipe and the muffler and that shpuld pass the sniffer test.

 

[Gadget]

If you put the stock Y pipe in there is a very good chance it will pass the sniffer test.

G

 

[curtis.bradley.clark]

does the motor work beter with shortys or long tube and will not haveing cats hurt the motor

 

[Gadget]

You will get better power and performance from the DT LT headers.

Not having the front cats will not hurt the engine.

Gadget

 

[Slywhitty]

If you put the stock Y pipe in there is a very good chance it will pass the sniffer test.

G

Is this really true? I have dtlt and magnaflow catback with the stock y. i could possibly pass??? i hope so that would be soo much easier then changing everything out:rock:

 

[Gadget]

It is worth a shot.

I know plenty of people that passed a sniffer test with just the rear cats in.

Gadget

 

[Slywhitty]

It is worth a shot.

I know plenty of people that passed a sniffer test with just the rear cats in.

Gadget

Cool thanks G!!!:top: here in ontario you have to go once your vehicle is 5 years old. so ill be due in a couple years. the test is only 30 bucks so i will definitly just try first:biggrin:

 

[rat7761]

Nicely done!! The headers open up a lot of power. I would expect you to pick up 2-3mph in the 1/4.

Yup, I picked up 2 MPH on average. Went from 98 MPH to 100 MPH.

 

[Trick61]

nice! cant wait to get a pair for my X

 

[DoubleD]

Has anyone thought about removing them and putting magnaflow high flow cats?

 

[grantman55]

There's definately more power and it doesn't feel like the truck lost any low end. A 12mm flex head gear wrench makes it a lot easier to tighten the header bolts. Make sure you remove the exhaust manifold brackets on the bottom during installation. There's a lot of room when the brackets are removed. Both headers went in from the bottom. The driver's side header is a little tricky because of the steering shaft but it goes in without removing the shaft.

I just had to bend a wiring harness bracket and zip tie the wire out of the way so it didn't touch the headers. It's the wire in the pic. It runs down to another bracket on the framerail which is the one I needed to bend.

sweet

 

[grantman55]

You will get better power and performance from the DT LT headers.

Not having the front cats will not hurt the engine.

Gadget

so how would i delete the check engine light and my local tunner said there not much they can tune on my truck its a 07 xrunner

 

[o0opackersfano0o]

o2 simulators

 

[NHXRUNNER]

so how would i delete the check engine light and my local tunner said there not much they can tune on my truck its a 07 xrunner

And if you don't have a MAF Calibrator, or other form of tuning device installed on the truck your tuner is correct. The stock ECU can not be tuned.

 

[grantman55]

And if you don't have a MAF Calibrator, or other form of tuning device installed on the truck your tuner is correct. The stock ECU can not be tuned.

damn thanks guys any try the spark plug non foulers trick for the checkengine light tricks the ecu making it think there a cat there

 

[Gadget]

so how would i delete the check engine light and my local tunner said there not much they can tune on my truck its a 07 xrunner

You can use the URD Rear O2 Sensor Sim. If you purchase headers and the sim together from URD you will save a lot of money.

http://urdusa.com/store/Electronics...1GR-FE-4.0L-V6-Dual-Channel/product_info.html

 

[grantman55]

You can use the URD Rear O2 Sensor Sim. If you purchase headers and the sim together from URD you will save a lot of money.

http://urdusa.com/store/Electronics...1GR-FE-4.0L-V6-Dual-Channel/product_info.html

thanks g my headers just got here thinkin anout using some homemade remedy for the check engine light

 

[MaK10-XRnR]

I have the DT shorties with the stock cats welded onto the back of it. Passes smog in the state of California no problem. I do wish I had a midpipe to get rid of the post cats, though.

 

[grantman55]

I have the DT shorties with the stock cats welded onto the back of it. Passes smog in the state of California no problem. I do wish I had a midpipe to get rid of the post cats, though.

im running long tubes no cats loud as hell and a home made o2 sensor extention to keep the ecu from triggering the check engine light oh have a suoer 10 muffler and its still loud as hell thinking about adding glass packs or a resonator