Cat Only Delete, Pre Muffler Only Delete or Cat & Pre Delete?

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    I’ve read through as many posts as I could find on this but still not clear to me, hoping someone might be able to help.

    I have 2018 Vitpilen & like many people who visit this forum I’m after a different sounding exhaust, I’d like something a bit louder & a bit deeper than stock but not offensively loud. If the bike could pick up some extra power that would be great but I really just want to be heard in traffic better.

    I initially thought simply adding a new slip-on would solve this problem but after a bit of reading most people also suggest a Cat-Delete. It’ not always clear, however, if they are replacing the Cat-Converter or the Pre Muffler (black box sometimes referred to as chamber) or both.

    What I’m interested in understanding is the sound & performance differences of the three possible configurations:

    – Cat Delete Only
    – Pre-Muffler (Chamber) Delete Only
    – Cat & Pre-Muffler

    Does anyone have any knowledge on this they could share?


    For those in my position there are a few legit companies offering parts to make these modifications as well as a bunch on Alibaba & Ebay. Below is a list of the ones I know of, I’m sure other members would be happy to share more. Note these apply to the 2018-2019 Svart / Vit models. 2020-21 have different offerings.

    Competition Werkes

    – Cat Delete only
    – Pre-Muffler (chamber) Delete only
    * Cat & Pre-Muffler deletes can be used together*

    Leo Vince

    – Cat & Pre-Muffler Delete (single part)
    – Cat Delete Only


    – Cat Delete Only


    – Cat Delete Only
    – Also sell ECU kits for remapping & air box kits

    Also worth noting there is a DB-Killer installed in some slip-ons. This may or may not be removable or offered as an optional extra. This part reduces noise. In the stock muffler this can be drilled out and some members say the sound is great. There is no going back from this mod though as you have to cut the part out of the muffler. I believe this also applies to the Akrapovic. But it might be enough for you to simply drill this out if you’re just after a louder bike and don’t care about modding the muffler.

    *Note I’ve also posted this on the Vitpilen channel as they are separate threads*


    Hi Ghost,

    I’m gonna try to share my experience here. I have a 2020 Svartpilen 401 but I guess you could take some stuff.

    I shared few mails with Coober engineer about the best set up for a Svartpilen 401 2020. They told me that the most reliable and powerfull one is : slip – on exhaust, stock chamber (to keep the back pressure on), cat-delete with ECU and air box lid. This is what they find as the best set up (if you want to run your bike as long as possible, in a best way possible).

    To my own experience, for now, I have a Werkes Competition slip-on and ECU Coober. The slip-on by itself is fantastic ! Sounds louder, deeper and pop’s just fine. Not too loud, not too quiet. Sounds like a real bike for me now. And with the ECU Coober, the bike is new. More torque, more power, more end speed. Gears are longer and you lose the hollow that you can feel sometimes. This things, put the bike always in the right spot !

    I guess, this is the same for a 2018 Vitpilen, but you can ask Coober. I want to try the cat delete, with the air box lid, I’m just afraid of being to loud with the cat-delete.

    Hope this will help you a bit. But Werkes Competition slip on only will make you smile everytime you start your bike 🙂


    does anyone know what size pipe work is used on the chamber delete?



    Hi Leekerbonat

    Thanks for sharing your improvements, the Werkes competition looks and sounds great, did you get the Werkes DB killer as well?

    The Coober ECU gets lots of positive reviews from the forums although its not cheap. The box just goes under the seat right?



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