Does it need to be retuned after doing that?
Short Answer Yes
Long story
Provided you have the correct ECU
1
If you still have the stock exhaust ,closed air box, and ECU.the stock ECU is not tunable Not tunable.
2
If you have the Ducati termi slipons with open air box and ECU kit fitted ,the ECU supplied with this kit is Tunable
This ecu is suitable for the mid pipe conversion ,
my self and Mark have just gone through this process.
The guys at Dmoto Tuned them up nicely,for $100 while you wait
Mine was more or less right as it was,just needed a small tweek
3
Or you can get the Ducati performace full system Ecu and have it tuned (if you don't have the correct ECU)
There are other options, those are the simplest imo