Air box changed?
The airbox should look different too. The stage 1 air boxes have vents on the outsides, stock one's do not.
Is it possible they got the filter right, but didn't swap the air box reducing your airflow?
The following text is from the Victory catalog for the 2009 Kingpin: The enhanced performance is delivered by the system’s vented air box cover, performance air filter and EFI calibration.
'09 Kingpin 8Ball
'06 HD Road King
'06 Vulcan 900 Classic
Last edited by ks_greg; 10-02-2012 at 10:01 AM.