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  1. 8-4-1 Headers (Video)

    I think we were all hoping for something along the lines of this

  2. 8-4-1 Headers (Video)

    My guess is we were all hoping for something along these lines, but it clearly didn’t come to fruition. And this isn’t even a Voodoo, it’s a Coyote. Post a vid when you get the chance. I think I’ve always been drawn to ARH’s full system with cats/res because it took away all the rasp.

  3. 8-4-1 Headers (Video)

    @TreeFiddyAre sorry that you took the plunge and it didn’t work out (I agree it sounds terrible), but hopefully this new setup sounds killer!

  4. 8-4-1 Headers (Video)

  5. 8-4-1 Headers (Video)

    The jury still seems to be out on how good this system will sound on the Voodoo. However, I personally think the S650 5.0 sounds amazing with these 8-4-1’s.

  6. 8-4-1 Headers Now Available

    Stainless steel

  7. 8-4-1 Headers Now Available

    At the moment no, but they have made tweaks to the production version that is expected to create power gains.

  8. 8-4-1 Headers Now Available

    For those of you that aren’t tracking, Concept 841 just dropped their 8-4-1 full exhaust system and it’s available for pre-order. Test car is an S650, but it sounds insane and much smoother than any other exhaust on the market currently. Pre-Order Link...

  9. 8-4-1 Headers (Video)

    https://concept841.com/products/shelby-gt350-2016 Link for Pre-Order

  10. 8-4-1 Headers (Video)

    Agreed, my personal favorite setup on the GT350 is the full ARH system (w/ cats & resonators) that Obsessed Garage put out a few years back on YouTube. Need to hear more of the Concepts 8-4-1 still. I do really like the sound that these headers are putting out on the S650 though.

  11. 8-4-1 Headers (Video)

    Hopefully we get a video tomorrow

  12. 8-4-1 Headers (Video)

    Cats/Resonators won’t be offered the first round, but they’re open to it depending on how things work out. With this manifold design it might take the pulse crash away anyways.

  13. 8-4-1 Headers (Video)

    In case anyone is confused, OEM motor mounts stay. It’s just the metal brackets that change. Header design is double slip and isn’t 100% rigid so there shouldn’t be additional harmonics. Concept 8-4-1 owner originally planned to force us into getting a GT500 / S550 dual tip valence to run the...

  14. 8-4-1 Headers (Video)

    Preorder will still be around $5k for the GT350. It is headers to tips and retains OEM valve control. Will also include CNC Engine brackets that are required for the headers to fit.

  15. 8-4-1 Headers (Video)

    GT350 lol

  16. 8-4-1 Headers (Video)

    S550/S650 was just under $5k for the full system. Asking about 350 now

  17. 8-4-1 Headers (Video)

    Should have a video to post on Monday featuring the full system.

  18. 8-4-1 Headers (Video)

    I will post more to this thread as they continue to release more content.

  19. 8-4-1 Headers (Video)

    Spoke with the owner of Concept 841. They are actually the brains behind the 8-4-1 design and used to work with Celeritech before going out on their own. I wouldn’t expect Celeritech to make something like this anytime soon.

  20. 8-4-1 Headers (Video)

    I’ll try and screen record it and post as well.





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