es9j4s exhaust front section (eliminating cats)
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  1. #1
    Tadpole
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    Default es9j4s exhaust front section (eliminating cats)

    Hi guys I want to do the front section of my exhaust on the es9j4s. What's the best way to go about this? Swap with the earlier model headers? But then how do you get around having no cats and the degraded mode of operation? Can you relocate the O2 sensors to the middle cats? Or is the only way you can do it by a remap? Where can you get one? Autoparis Melbourne?

    Basically, how do you fix the restriction in the front part of the es9j4s exhaust for better flow/efficiency/power?

    Information will be greatly appreciated! Cheers, John.

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  2. #2
    Contented Peugeot Driver addo's Avatar
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    What about the O2 eliminator type gizmos? I think there are some with up to four outputs so you can spoof a full set of V6 or V8 exhausts.

  3. #3
    Tadpole
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    You've done this exhaust modification haven't you Addo? How'd you do it :p

  4. #4
    Demannu-facturing! Demannu's Avatar
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  5. #5
    Contented Peugeot Driver addo's Avatar
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    To digress, I believe most custom exhaust manifolds will struggle to show real gains over factory on a modern design of European motor, especially in the practical range of RPM. And I further believe the upstream sensors are useful whether you're running a standard ECU or aftermarket.

    Where my gripe rests, is with the dilemma faced by owners of cars approaching lifespan of the factory converters. OEM spec replacements are often north of a thousand, or there's cheap and tinny alternatives that seem barely worth the effort of fitting. To me, this is where there's some economic sense for an owner in straight piping a cat - and at least spoofing the downstream signal for relatively normal operation.

  6. #6
    Tadpole
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    Thanks for the info ^

    So I understand removing cats and using simulators/fudging the signal for the downstream can work but can be problematic.

    So, if running the non cat headers and using the middle cats, it's still legal(ish) but how? Can these ECU's be remapped or piggybacked to cope with the changes?

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