430 - Isn't this the 'always' open exhaust valve mod? (Kreissieg exhaust installed) | FerrariChat
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430 Isn't this the 'always' open exhaust valve mod? (Kreissieg exhaust installed)

Discussion in '360/430' started by iheartf430s, Jun 27, 2025.

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  1. iheartf430s

    iheartf430s Karting

    Feb 17, 2023
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    #1 iheartf430s, Jun 27, 2025
    I'm trying to get to my 02 sensors and my 430 has a Kreissieg exhaust, so I took off the shield to see if I could access them the easy way (no luck of course).

    When I pulled the shield I noticed these plugged off lines (attached pics).

    I recalled seeing a video that plugged off these lines to keep the valves open.

    While one has a screw in to plug it, the other doesn't. Is that a big deal?

    My exhaust has the 2 and 5 setting: quiet and very loud at revs. But I dont know too much about these exhausts (got the car in Feb). Doesn't the exhaust still need the valves to flip between 2/5 sounds?
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  2. GogglesPisano

    GogglesPisano F1 Rookie
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    #2 GogglesPisano, Jun 28, 2025
    If you have valves, plug those in. If not, cap off both.
     
    iheartf430s likes this.
  3. Qavion

    Qavion F1 World Champ
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    #3 Qavion, Jun 28, 2025
    The Kreissieg appears to come with its own vacuum solenoid, so the important plumbing will be attached to that. The pipes in your photos may not be used.

    Just to be sure... is there any vacuum on the uncapped pipe with the engine idling?
     
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  4. hazarri

    hazarri Karting

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    #4 hazarri, Jun 28, 2025
    Interesting as I just bought a scuderia and have a Kreisseg fitted. Mine is 1 and 5. I get catless fumes with both valves open and closed, and @Bulletproofauto has confirmed the design is a partial cat bypass.

    What I am now curious about is how much is bypassed? 50/50?
     
  5. ShineKen

    ShineKen F1 World Champ
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    #5 ShineKen, Jun 28, 2025

    How’s the sound?
     
  6. hazarri

    hazarri Karting

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    #6 hazarri, Jun 28, 2025
    insane. I’ll try to get a sound clip. Sounds very similar to a V12 Murcielago I had with Fabspeed exhaust.
     
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  7. iheartf430s

    iheartf430s Karting

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    #7 iheartf430s, Jul 1, 2025
    Confirmed! The exhaust sounds insane!

    And props to @Bulletproofauto that took the time to email the company in Japan to look up my exhaust serial # and give me the exhaust settings
     

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