Stock Tune w/ Catless Long-tube Headers

Discussion in 'V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning' started by Alvey, Oct 17, 2018.

  1. Alvey

    Alvey IG: @ItsAlvey

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    Looking for some insight on how safe it is to run the stock tune with catless long tube headers. Any info would be appreciated. 2018 GT 6-speed stock aside from a catback.
     
  2. BmacIL

    BmacIL Enginerd

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    Nope. Will get CEL.
     
  3. OP
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    Alvey

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    What exactly is CEL?
     
  4. BmacIL

    BmacIL Enginerd

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    Check engine light. It'll eventually start running like crap.

    If you want to do any form of cat delete, you need to tune.
     
  5. Nuked

    Nuked Well-Known Member

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    Get a tune. The bang for buck of a tune is much greater than longtubes w/out a tune. If you have E85 in your area get the tune for that. 2018 make solid gains with E85.
     
  6. CEHollier

    CEHollier Well-Known Member

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    Another vote for a flex fuel tune. An initial must.
     
  7. OP
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    Alvey

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    I think my concern is less of what my best bang for buck is right now and more of whether or not I can safely run catless headers without a tune
     
  8. Kinjirra

    Kinjirra I R Slow

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    No you can not run catless anything with a factory tune unless you want check engine lights and for the car to run like poo. What they are saying is that since you NEED a tune you might want to get it tuned for e85 at the same time(costs the same) and you will see even bigger gains.
     
  9. thehunterooo

    thehunterooo Well-Known Member

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    Why stock tune? Seems like a waste to get catless headers if that is all you would do. If you are worried about warranty that much then you probably shouldn’t touch them anyways.
     
  10. OP
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    Alvey

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    Who mentioned anything about warranty throughout this entire thread? The motive for running a stock tune shouldn’t matter, I was simply looking for the answer to a question
     
  11. AZ18yote

    AZ18yote Well-Known Member

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    CEL and unpredictable/poor performance.
     
  12. Nuked

    Nuked Well-Known Member

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    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.
     
  13. thehunterooo

    thehunterooo Well-Known Member

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    It’s a weird question I was just to trying to understand the point of staying on the stock tune and adding headers. Unless you meant you are having them installed/installing them yourself and then driving it on the stock tune to have it dyno tuned?
     
  14. Zinc03svt

    Zinc03svt Well-Known Member

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

    Zelek Well-Known Member

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    You shouldn't plan on getting headers unless you are going to tune the car. Otherwise, you just paid a lot of money for more noise, possibly less performance, and a rich running engine once that CEL goes off which will take your gas mileage down to probably about 12-15.
     
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