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Replaced the catalytic converter with Competition Werkes Cat Delete Part #WKT391D which will accommodate any slip-on designed to fit the stock exhaust.
http://www.competitionwerkes.com/index.cfm/product/6567/cat-delete.htm
<p style=”text-align: right;”>Does it affect the “not legal” display on the ECU? Or give you a check engine light?</p>
“Love it can you post a few pics of the total side profile as well ? How does it sound/run now?”
It’s definitely louder and sounds a little deeper. The throttle is clearly more responsive and it seems to have gained a little more power…that last part might just be my imagination though.
I’m still running the stock muffler so unless you know what to look for, it looks totally stock from the side…I’ll get a few profile pics up soon.
“Does it affect the “not legal” display on the ECU? Or give you a check engine light?”
Not sure what the “not legal” display looks like so I guess the answer is no, however, I have seen the “Check Engine” light come on but only momentarily and it shut off almost immediately…I’ll monitor it closely and keep you posted.
What I have noticed is that it appears to be running more rich. Not so much in the sense of performance but only because I can smell fuel…predominately upon initial start-up. I’m assuming that the role of the cat is to retain the un-burnt fuel and burn up whatever wasn’t consumed. And now that it’s gone, I’m guessing that’s what I’m smelling…not quite sure how it works though :-/
So there is no secondary O2 sensor on our bikes. That’s why it doesn’t throw a CEL. Which also means, it is not running anymore rich, since it doesn’t use a wideband O2 to adjust the a/f mix.
You are smelling fuel and noxious fumes that are normally neutralized by the metals in the catalytic converter. You will smell it at stop lights and especially at idle when the bike is warming up.
There should be some dynos out there for the RC390 or Duke for before and after removing the cat.
Record a sound clip? I’d like to hear it. Though I knew when I got the bike it will never sound “great.” It’s too small of a single cylinder to really ever sound super cool.
“Love it can you post a few pics of the total side profile as well ? How does it sound/run now?”
“Record a sound clip? I’d like to hear it.”
https://soundcloud.com/unorthodoxed-pickle/vitpilen-401-cat-delete-stock-muffler-01
“Would love to hear as well. how was the installation? Straight forward?”
Installation was a cinch. All you need is a few sockets…I believe they were 8mm, 10mm & 12mm…not 100% sure but if you have a complete metric set you’ll be good to go. Entire replacement was completed in under an hour and done entirely on the sidestand (kickstand). You might want to use some Teflon tape on some of the joints but I don’t think it’s necessary.
Check out this video on an RC 390, with a different exhaust…it’ll get you in the ballpark:
https://www.youtube.com/watch?v=_RqHaf1Yyu4
So what does this do to the sound? the only thing Id like to do to my Vitpilen is make it LOUD. Is this all I need? I figured the Akro slip on would do nothing unless we delete this HUGE cat. I was hoping to do exactly what you did here and get a great sound. Can you post a vid of the sound?
Thank you
“Can you post a vid of the sound?”
I posted a sound clip earlier…check it out:
https://soundcloud.com/unorthodoxed-pickle/vitpilen-401-cat-delete-stock-muffler-01
“the only thing Id like to do to my Vitpilen is make it LOUD. Is this all I need?”
Sounds to me like you’re looking for something louder than the Akro, minus the cat delete. Perhaps something more like this:
http://www.competitionwerkes.com/index.cfm/product/2520_3332/gp-slip-on-exhaust.htm
Based on my research, the Werkes WKT390 is a slip-on for earlier model RC’s & Dukes so you’ll likely need to swap out the head-pipe from an earlier model Duke (KTM Part# 90205007000).
https://www.bikebandit.com/oem-parts/2015-ktm-390-duke-bl-abs-b-d/o/m156771#sch896383
Clearly, I chose not to go this route so you may want to thoroughly research this option and and please keep us posted on your findings.
Another thing to keep in mind is that this exhaust is really freaking loud…and I mean obnoxiously loud so you may want to do a little research on that as well.
I just ordered the Remus slip on for my Svartpilen.
https://remus-motorrad.de/REMUS-Exhaust-Vitpilen-401-EE
Will update on how it goes.
Looks great! I like its clean, cylindrical design and the stainless pipe…goes well with the rest of the bike.
Will you be deleting the cat or are you leaving it on? Either way, I’m sure it’ll be quite an improvement from the stock muffler =-/
Anxious to hear your results.
Do you have any idea if this cat delete mod voids warranty?
Does the stock catalytic converter have any electronic device/plug/O2 sensor tied to it?There is no post catalytic sensor O2, so the ECU can not detect that it was removed.
It should have no affect upon warranty coverage.
Awesome Thank you ! that sounds good I think Ill do the same just replace the cat pipe. One last question, does this cause any errors with the bike or require any other adjustments?
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