When you do the pipe swap, see how it reacts.
If it coughs or sneezes, then that would be an indicator of a lean condition, and the pilot jet would be the first to be addressed.
Also, take a peak at the plugs to monitor the color/burn/timing. 
Scott
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"If a street Harley doesn't have torque, how much horsepower it makes, simply does not matter."
"Treat your dogs with respect, keep your traps oiled and checked, and Beechnut is the tabacco to chew." The Renn, date unknown.
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