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Discussion Starter #1 (Edited)
I managed to get a hold of a SC Project slip on exhaust (no cat delete) for my Duke 390 2nd gen bike.
  • Do I need to buy a piggyback controller if I change the slip on?
  • Will it work fine on stock?
  • Will a Booster plug or Rapid bike easy be enough for a slip on exhaust if i need to change the fueling?
This is my first motorcycle so I don't know the ins and outs of exhaust and fueling yet. Thanks in advance!
 

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I myself have just purchased a new 390 duke and the dealer has told me the slip on muffler can be done without a remap. If using an akrapovic slip on I can still retain the factory warrenty
 

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In general, if ONLY replacing the end can you should be okay without a piggyback/booster-plug.
As Matt mentioned the PowerParts Akrapovic will have you keep the warranty (not any spinoff Chinese Akra from the on-line aftermarket suppliers).
Another thing you need to bear in mind is that you most likely loose on power and torque changing to the SC Project can.
 

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Discussion Starter #4
In general, if ONLY replacing the end can you should be okay without a piggyback/booster-plug.
As Matt mentioned the PowerParts Akrapovic will have you keep the warranty (not any spinoff Chinese Akra from the on-line aftermarket suppliers).
Another thing you need to bear in mind is that you most likely loose on power and torque changing to the SC Project can.
Does losing that power and torque have a negative effect on the engine?
 

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That is a very good question to which I have no direct answer.
 

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Does losing that power and torque have a negative effect on the engine?
The stock tuning is too lean in order to meet emission standards. I added a wide gauge o2 sensor to tune my bike. I bought a piggyback and used potentiometers to adjust stock sensor to read leaner, therefore making bike run richer in open loop. I adjusted one for sport riding to afr 13.5, which fixes the below 4500rpm stuttering/jerking. The other is adjusted for better gas milage to 14.7 I partioned my map with R-Tune and made 6200 to 6400 richer by 15% to get rid of a flat spot near 3/4 to full throttle. The rest of closed loop is adjusted from 13.5 to 12.9 at higher rpm/load for more power. Its still not perfect but I will do data logging next year to get it spot on. My bike rips and is smooth at all throttle and rpms now.
Making any changes will change the mixture. Nobody knows how much or where it will change unless you measure it. My premuffler and cat delete caused the wide open throttle to run richer by about 7%. If it became 7% leaner instead, motor damage could occur.
Either do what I have done, get a dyno tune, or simply buy something like a Rapid Bike Easy or Booster Plug.
 

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Does anyone have the Competition Werkes slip on exhaust for their bike? If so, does it reduce power and torque? I’m considering getting one, but based on what I’ve read on these threads is that it seems like most slip on exhausts reduce power. Does deleting the chamber help with power loss? Im new here, and trying to learn as much as i can about my new 2020 390 Duke.
 

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I deleted cat and chamber( with Werkes)and kept stock muffler. Its a lot louder. I like it but have to be be consious to let off throttle around people and passing cars.
My wide band afr meter showed running 5% too rich wide open. That would reduce power. If it went lean instead, engine damage can happen.
I adjusted afr to 12.8 -13.2 with Powertronic.
There fore if you remap you probably get more power, less if its not remapped.
 
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