Okay, here it is.
2001 Monster 900
Before: Pipercross air filter, Sil Moto low megaphones - no dB killers = 75.33 HP/53.40
After: +PC3, open airbox lid, custom map = 78.33 HP/55.40
I like the "whoomp, whoomp, whoomp, whoomp" sound at idle, and the BWWWWOOAAAHH!!! at WOT.
From my short ride, it's smoothed things out a little and reduced backfiring a bit.
I'll probably have to wait until a little later to give a more descriptive ride report.
Thanks to Faster Motosport in Denver. Thanks Bart!