Stock Tune w/ Catless Long-tube Headers

[Ebm]

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[LethalPerformance]

As the others mentioned you're going to get a check engine light running no cats and headers with the stock calibration. You're also not going to fully benefit from that setup without a tune as well.

My best recommendation would be to go with the headers, custom tuned device and run E85 if you can to get the best gains. You'll still make great power with 93 octane but the switch to E85 is a night and day difference.

You can get into a nice set of stainless headers like Pypes or Texas Speed for pretty cheap and then all you'll need is the tune and device which we offer from 4 of the top tuners in the industry.
We've got Lund Racing, Palm Beach Dyno, AED and Li Tuning & Racing all under one roof. So take your pick and her rip!

The Texas Speed header setups are in stock at $699.99 which is a smoking deal.
https://www.lethalperformance.com/t...3-headers-with-off-road-connection-pipes.html

Pypes
https://www.lethalperformance.com/p...offroad-connection-pipes-factory-connect.html

The Tune Shop!!
https://www.lethalperformance.com/ford-mustang-v8-gt/2018-2019-ford-mustang-gt-coyote/custom-tunes-2

 

[Rjames18]

Most of these comments are correct in some of what they say but wrong in other parts.

Yes you will get a check engine light for not having cats.
Yes you can run the car and beat the hell out of it without cats, the car is able to compensate for the extra air movement. The car will still keep the AFR's in its safe parameters and not allow the car to run lean.
This has been tested by Lund, VMP, myself and many other companies.
The problem is that you don't gain anything until you get a tune.
I have numerous times of running my car at the track. Before headers ran a solid 12.20 almost every time. After headers the fastest I ever got was a 11.95. I believe it was mostly due from getting a better 60' at a different track.

 

[ENPhoto]

You will get a check engine light for downstream O2's, and the fuel trims will likely be off due to the transport delay being screwed.

Agreed. Lethal put up some good information as well.

A Tune is advised.

Catless headers? We have factory widebands in there. When you install headers, I believe that the one set of o2 sensors are moved FURTHER downstream. Causes a lag in that data getting to your computer. Catless also don't let your sensors warm up fast enough and can have an issue keeping them hot. Long Tubes will cool this exhaust flow and change what your computer "thinks" it should read. (this information is from a few HPT sources and books)

The tuner needs...at minimum to change your:
- Transport delay
- Transport time constant
- Closed loop o2 time constant
- Rear Config (depends)
- Heaters
- DTC code disabling

In order to get the MOST out of your headers, you should get a baseline done and have the MAF Period and Spark tuned as well.

 

[compucarnut]

Jeebus...? If you honestly have to ask what a CEL is you should not be modifying you car. Where do these people come from...?

Took the words right out of my mouth. I've known what a cel light was since like 1998 when I was in high school. smf lol

 

[AZ18yote]

To be fair guys you don't know what you don't know. Not knowing a cel is up there with wanting to go cattless lth with no tune. Maybe he's just looking for knowledge on the platform... <=== devils advocate...

 

[turboluke9000]

To piggyback off this, running catless on the stock tune should be ok for a short drive from exhaust shop to dyno or to home right? No need to flash a tune right at the exhaust shop?

 

[bluebeastsrt]

To piggyback off this, running catless on the stock tune should be ok for a short drive from exhaust shop to dyno or to home right? No need to flash a tune right at the exhaust shop?

That's fine. But if it was me. I'd just buy a handheld tuner. And load a mail order tune myself after the headers are installed.

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