Had the pops and farts on Sophie.
Ordered the PCIII with the Ferracci full exhaust last spring.
Farts and pops are now gone,Dyno tuning got rid of a couple of flat spots and made the torque curve slightly more wide.
Seat of the pants feel indicates there is more usable power everywhere,and throttle response is even better than factory.
The PCIII did NOT turn the bike into a Hyabusa loose in a china shop,but it did bypass the burps and glitches while making the bike more pleasing to ride.
It's a good buy,and especially so when the bike is tuned using the thing.
The Map sent on the PC was darn close to start with,and I suspect individual bike deviations were the only thing that had to be tuned out by the dyno shop.
I would gladly add the PCIII to the next Duck I get my hands on.
Hope this helps.