The exhaust on the WSBK Panigale is one of the most complex systems I've seen. Varying diameters, resonance chambers offset lengths, flapper valves and a 2>1>2 design! Wow! Change the cam specs, cam timing and or the intake/throttle side size and length, even just a little, and you would need to tweek the exhaust side at the same time. You would probably need a VERY capable computer along with a specific engineering SW program to calculate all the data.
The whole purpose of such an intricate design is to not to just increase the power but to spread it over in a specific rpm range range. For WSBK it is likely to be in the top third of usable RPM's. It wouldn't surprise me if Ducati has a couple different WSBK exhausts designs. One used for the tight lower speed tracks where a broader torque range is needed and another for the faster more open courses where you need more top end power.
Putting on a leftover WSBK or designing a true copy of the exhaust on stock Panigale probably won't give you much USABLE increase in power. In fact, it would most likely hurt you in the end. Remember, it is a racing package or system....you need to modify the whole engine to near WSBK specs in order to get the most out of the exhaust. If you don't, you will create flat spots and power spikes making it harder to put the power down to the track in a predicable, linear way. BTW - You don't even want to think of how all thus might screw up your traction control either...!
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Think about it... There is a reason why Moto GP teams show up a couple weeks before a race to tune for a specific track. It's not just about the tires. The electronics traction control and engine tune along with suspension and brakes are all set up for that track and more important to the super human alien skills and style of the professional rider.
To be honest. I would look at what is used on the Panigale for Superstock class racing as a basis for your exhaust design. They aren't allowed many internal engines mods so their designs are based to making the most of our stock design. Since I'm not independently wealthy any system I would use would have to be somewhat simple, affordable and easy to repair or replace AND make better power too.
IMO - That makes for a very full plate...
