Cobra NH on harley softail 107

[Timber0472]

Anyone have any experience with cobra neighbor hater softail slipons? I just picked up a 19 FLHC two weeks ago and put a RS468 cam in it. Heading to dyno next weekend and just curious what I might expect. Ness big sucker and stock headers with the 3" cobra NH with stock baffles. Sounds good but I have no idea about how they perform. Hp/tq killers? Do they provide a decent amount of back pressure?  Can't find any dyno numbers on them. Even a softail 107 with a 468 cam is hard to find info on. Anyone?