Power difference in catted vs cat less LTH?

Discussion in 'V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning' started by drumstick, Jul 3, 2018.

  1. drumstick

    drumstick Well-Known Member

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    How much power difference is there in a catted vs non catted long tube set up in a full bolt on car?

    Is the catted going to be loud anyways and not worth it? My inspection is close to 2 years away (bought the car brand new)
     
  2. Joe 5.0

    Joe 5.0 Well-Known Member

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    I don’t have actual data for you, but I’ve heard the power difference is miniscule and nothing to stress over. In regards to sound, if you’re getting headers and you’re worried about being too loud, give this protential purchase some more thought.

    As for emissions, high flow cats will definitely help, but they’re not guaranteed. You’ll have to ask your tuner for an emissions tune. Plenty of guys on here have passed emissions with longtubes, both catted and catless.
     
  3. Lonmon

    Lonmon Well-Known Member

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    The key is the fact that even catted headers use high flow cats that do not restrict much power or sound. Catted headers will be just about as loud and make very close power as well. The stock cats are what quiets things down (aside from adding resonators or chambered mufflers) and restricts power. I dynoed before and after adding high flow cats specifically to quiet things down and only lost 1whp. It also did not quiet things down hardly at all. I ended up switching catbacks to a chambered muffler design to get the sound under control. This was on my 15 BTW.
     
  4. revinto7

    revinto7 Well-Known Member

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    for what its worth my 14 1LE made 801/646 through HF cats and 801/640 same day no cats so its very minor if at all
     
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  5. WildHorse

    WildHorse N/A or GO HOME

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    My buddy went cat/res/muff delete w/ x-pipe and slowed by almost .5 sec on his NA '15.
     
  6. Deep Blue

    Deep Blue Member

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    I've dynoed a few of my cars before and after high flow cats, I believe it was 3 hp or less difference on a typical bolt on car or heads/cam LS1. Not smelling like gasoline is also a great reason to get cats. No girl wants to go out on a date and smell like she just left Shell. :)
     
  7. Nuked

    Nuked Well-Known Member

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    That's why you run E85 and she smells like she just left the movies lol.
     
  8. sigintel

    sigintel Well-Known Member

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    What kinda movie theaters you go to?.. lol
     
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  9. Myshelby3425

    Myshelby3425 Well-Known Member

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    Slowed him down? With or without tune for the new setup?
     
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