01 Ultra. I bought it used last June. Only put 200 miles on before running out of weather.This type MC is brand new for me ( had a roadster). I sent the bike in for a 30,000 service..just got it back. The MC had Vance/Hines True duels with stock mufflers and stock air cleaner. Tech suggested I 'complete' the stage one by installing a High flow air cleaner ( STI FLH DIGI and Stage 1 EFI kit.whatever that is). MC seems to run fine but, one of the things I loved about the MC was it's quietness..Now, with this air cleaner, I get a lot of sound ( like the old muscle cars when we punched it..that sucking/howling sound from the carb/s) from the air cleaner...Normal?. Should I have left it alone or go back to original air cleaner and remapped?. OR..as the tech suggested, this is better for the MC?