The black rubber ones never wore out for me an the silicone are soft and very susceptible to rubbing damage.
The rear disc brakes used a drum proportioning valve so they did not function right under normal use, after having had all three rear brake setups in the same car the discs stock for stock are NOT an upgrade.
Many civilian cars had the external tranny cooler.
The 9C1 external oil cooler blindly cools oil rather than regulating it with coolant temp the way the civilian setup did, might have been right for a car idling with the AC on for 8 hours in a median somewhere but not the best setup for an actual driver.
The front calipers were wider to take a thicker inner pad, I am sure you think that is a drastic upgrade somehow
Far as the armor plates in the seat, I don't know anything about your life but if that means something to you I am very sorry. Those super seats also had lumbar support removed to make room for utility belts, another strike.
"high temp boot on brake calipers" what do you even mean by that? Just something you made up to put the car up on an imaginary pedestal??
I stand by my statement that there were no MEANIGFUL differences.
Oh yeah the rear axle was narrower to make room for snow chains, most people don't like it though because it makes the rear track width narrower than front.
Geez. I thought the OP was asking what was different not for my opinion on whether it was better. That list is what I noticed on the NYSP car before it went to scrap. Better or not is opinion. I agree the trend over the years has been fewer useful differences between Civilian and Cop cars. But there are differnces.
I bought that beat 9C1 for the cheap 5.7L LT1. I grabbed the cooling parts that weren't on My car because they were there. In My opinion they added value to My car. BTW I routed the oil return through the radiator and never drove it in the winter.
It makes a perverse kinda sense that the silicone hoses don't wear as well. I used them... But only put fun highway cruising miles on the car for a few years then sold it. The new owner had no problems with them though.
I liked the cushion top Bark-O-Lounger bench seat much better than those thrashed no bolster cop seats. I never took them out of the cop car. I ripped the backs off because I called BS on the stab plates. I was wrong. Makes you appreciate what a nasty job those guys have.
Raybestos lists High-Temp silicone dust boots in all their "Police/Taxi Service" calipers. I'm mildly surprised if this is not OEM considering the coolant hoses.
Thicker brake pads make sense on a fleet vehicle. Mine... MEH. Amusing comment though.
I sold the rear doors, front spindles with the brakes, rear axle, master cylinder/booster, and D-Block to a guy who wanted the cop brakes and some doors.
The Booster/MC, D-block and/or metering-valve, F&R Caliper bores, ABS, no-ABS, etc must be from the same system. If you mix-n-match it'll work like crap. I know the rear-disc brake master cylinder had different bores than the disc/drum master. Stock rear discs don't typically use a metering/proportioning valve just a D-block with a failure switch. The possibility that GM used a metering valve on the 90's 9C1 is a good reason to be glad I sold the brakes.