I'm one of the first ones on board the "dealerships suck" train, but idk...
So... my thoughts:
I can understand if the wires were spliced, that they wouldn't warranty the part... regardless of age/ miles.
What specific comment did the "fuckhead service manager" make regarding warranty issues and the aftermarket air filter? I mean... why replace it now ( unless you're going to take the Jeep to a different dealership)? He/ they already know that you have an AFE CAI on there, so removing it wouldn't really matter.
I can also understand them not handing out the additional 3 filters. That's not part of the free oil-change deal... and I would personally hate to show up at a dealership for an oil filter just to find that they were out of them since they had just given their last filters to some guy that's going to stock-pile them in his garage.
Not sure how many other dealers you've been to, but in larger cities I would think that if there tends to be a theme with several dealers, that you're just going to have to accept defeat and accept whatever terms they are laying down. At least in my neck of the woods, my primary concern is finding a dealership that is qualified and knowledgeable to perform service/ diagnostics.
If you can do the install, then hell yes... I would try to get the part direct and save some money... absolutely.
Why bitch to your plant manager? This has nothing to do with his job, his expertise, or his concern. Seems like the wrong person to seek assistance from.
JMO/ Good luck
Poly Performance - Dynatrac - Currie - Goodyear - Poison Spyder - Warn - PSC - AEV - Reid Racing - Off-Road Evolution - Flowmaster - Delta - Riddler - Micky Thompson - Daystar - Skid Row - Uniden - Rebel Offroad - Firestik - Warrior Products - Viair - HiLift - ARB - Kicker - Infinity