Go catless with boost

Discussion in 'Forced Induction - 5.0L V8 Engine' started by robmustang201528, May 29, 2018.

  1. OP
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    robmustang201528

    robmustang201528 15 mustang gt302blown

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    Thanks for everybody input and advice. I hope I saved you guys money and headache
     
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  2. Roh92cp

    Roh92cp Well-Known Member

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    Kooks headers with green cats about 3 years old 10k miles. One of the cats here as you can see is separating and folding in a bit. Anyone have experience with this with Green cats? I called Kooks today and the warranty is 2 years, but they may warranty anyway when they look at the pics. 638BBE43-E59D-4B08-BCA6-433265BD72D6.jpeg
     
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  3. Roh92cp

    Roh92cp Well-Known Member

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    My observations with going to Kooks 1 7/8 first with green cats, then catless. My exhaust consists of 3" MBRP that has the mufflers replaces with SS oval 4x9 3" straight through off ebay, these have a very deep tone. Also put in the midsection 2 MBRP 16" resonators.

    1. With my exhaust above and stock headers and cats the exhaust note was very deep 0 drone and not loud until you went into heavy throttle. Cold start was not bad at all.

    2. Kooks headers with green cats and my same exhaust the setup cold start was aggressive and med to heaven throttle loud, but not bad at all. I could have lived with this. Idle warmed was not loud and still could be driven lightly without much extra aggressiveness. No Drone.

    3. Kooks catless with 8" resonators in place of the cats, and same cat back. Very aggressive and loud cold start and very aggressive and loud medium to heavy throttle, too much for me. Warm idle is OK and driving can still be done lightly without much agressive sound. No drone.

    I will be replacing the 16" MBRP resonators with a Borla touring resonator to try and control the volume. 2A39FCA5-F8D3-452F-95B3-FD35210D8A40.jpeg ECB35301-5137-4D8A-B810-ADEEF1C43496.jpeg D3E0CD7E-8958-407A-BE48-8C91184AE1CF.jpeg
     
  4. SVT-DADDY

    SVT-DADDY World's heaviest S550

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    Nice review, thanks for posting.



    So you have 2 sets of resonators and its still too loud? If so there is no hope for me. I still haven't installed my cat delete....may have to switch it up.
     
  5. Dominant1

    Dominant1 Well-Known Member

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    Love the sound of my complete ARH system after removing the cats... I wouldn’t have it any other way.. and at wot, it wakes the dead!!!!!
     
  6. Roh92cp

    Roh92cp Well-Known Member

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    Deleting the cats added at least 25% more volume but mostly in heavy throttle. The sound stayed the same didn’t add rasp just volume.
     
  7. robwlf

    robwlf Well-Known Member

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    yeah im stock cats roush tune 670hp with 25k miles and i just replaced my plugs last month gapped to .028. replaced my exhaust at the same time, took a flash light up there my cats looked good . granted i dont beat the crap out of my car no track days either i drive very spirited with the long drive here and there to let her breath a bit
     
  8. Dominant1

    Dominant1 Well-Known Member

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    The op was tuned by lund and no one tunes more cars then lund. They know what they’re doing when it comes to tuning. These failures are not tune related, its a simple matter of physics. Aftermarket cats were never designed to handle the heat that boost brings...its just a matter of time before they fail. The op’s failed relatively quickly and he lost a motor to it. Its your money...
     
  9. Roh92cp

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    True Dat!

    Boost makes power, and power makes heat, and heat kills cats. I had my head up my ass running 14-15 psi at times with stock headers and Cats for too long. Fortunately nothing happened and my stock cats still looked good when I removed them. Whipple cal has cat protection, but that only goes so far at higher power levels. Nothing is gonna cool them enough at 750 wheel.
     
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  10. NotAFordEngineer

    NotAFordEngineer New Member

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    So, why does no one use the Roush tune? 727HP and I haven’t heard any complaints about melted cats. I also know they did extensive testing for that calibration.
     
  11. F1scamp

    F1scamp Well-Known Member

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    Because its a turd. I ran one a few weeks ago I beat so badly, I thought it was N/A until he opened his hood. :shrug:
     
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  12. w3rkn

    w3rkn Well-Known Member

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    Anyone bothered with a chambered exhaust sticks..?
     
  13. GT2

    GT2 Well-Known Member

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    Resonators aren't going to tone a header/catless car very much. They're not only straight through, but early in the exhaust stream, where exhaust speed is still really high. The closer to the header the muffler is, the less volume it reduces (also reduces flow more than later in the stream). Silencers are a great cheap option. One screw and you can putt the car around. Remove it when you know you're going to blast around.
     
  14. Roh92cp

    Roh92cp Well-Known Member

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    What are these silencers?
     
  15. OP
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    robmustang201528

    robmustang201528 15 mustang gt302blown

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    The car is put back together but running into some issues. Car cranks and sounds good but everytime they give it gas, it throws a wrench code. Hit the throttle rpms don't move at all. They re loaded the tune... still no throttle response. Has anybody ever came across a issue like this? They're not able to to a crank reset either. Throttle isn't climbing at all
     
  16. F1scamp

    F1scamp Well-Known Member

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    What fault codes does it have?
     
  17. ahl395

    ahl395 Well-Known Member

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    +1 what codes? Wrench light will produce a DTC just like a CEL will.

    My guess is the Throttle position sensor in the gas pedal, or maybe the sensor/motor in the throttle body.
     
  18. OP
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    robmustang201528

    robmustang201528 15 mustang gt302blown

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    Car starts but has zero throttle response. Throwing random codes that aren't true, low oil pressure generator code etc. They traced every wire and made sure every connection was tight. No pinched wires or loose connections. Only thing he can think of is a bad CPU. My question is.. do you think maybe when they put everything together a wire might've touched something blew a circuit in the cpu? Has anybody had any cpu issues before? They checked every ground wire as well. What else can cause no throttle? It won't rev. Car idles perfectly. Starts up without a problem.Thanks for your help
     
  19. superman07

    superman07 Well-Known Member

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    Kindly disagree, volume does not equate to quality or "the best".

     
  20. Burkey

    Burkey Well-Known Member

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    That’s true, but the logs I’ve seen show that Lund are pretty conservative on their Whipple tuning. Possibly even more conservative than the Whipple tune. :shrug:
     
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