Are drilled and slotted rotors worth the cost?

I have powerstop Z23 kits on 2 cars. They are fantastic for normal driving and upgrade over stock. 50k miles on one car and they have hardly any pad wear. The rebate process is easy and they deliver.

I plan on putting a Z36 kit on my truck when brakes are due.
 
Not relevant. A gun barrel is made as heavy as required.

Very relevant, applies to brake discs which you can see as a thermal management system.
Same concept for brake dics they are made as heavy as required. Sometimes not heavy enough.

Go look at 18 wheeler truck brakes, no dimpels or holes to see anywhere.
 
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No it's not. You want as much mass as required but no more. For example switching out single for two-piece would be better.

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Very relevant, applies to brake discs which you can see as a thermal management system.
Same concept for brake dics they are made as heavy as required. Sometimes not heavy enough.

Go look at 18 wheeler truck brakes, no dimpels or holes to see anywhere.
Do you honestly think a vehicle with solid one piece brake rotors will have better brake performance compared to the same vehicle mounted with lighter fully floating rotors that have the same heat capacity?
 
Do you honestly think a vehicle with solid one piece brake rotors will have better brake performance compared to the same vehicle mounted with lighter fully floating rotors that have the same heat capacity?

You pulled that statement out of thin air.
Do you know why a two piece floating rotor is lighter?
 
Ill try to explain it to you.
The actual disc part of the rotor is not necessary any lighter.

Floating discs can reach higher temps without warping, because of the floating nature and thermal decoupling and are for track/sport vehicles with pads that also allows higher temperature. With higher disc an pads temperatures you have off-gassing of the pads which is one reason to have dimples.

Brake force comes from friction ie pads and pressure. Not any special kind of rotor.
 
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Ill try to explain it to you.
The actual disc part of the rotor is not necessary any lighter.

Floating discs can reach higher temps without warping, because of the floating nature and thermal decoupling and are for track/sport vehicles with pads that also allows higher temperature. With higher disc an pads temperatures you have off-gassing of the pads which is one reason to have dimples.

Brake force comes from friction ie pads and pressure. Not any special kind of rotor.
Exactly and the design is why the rotors are lighter.
 
Here's an interesting video. This is between vented stock vs directional vented and lighter rotors. The lighter rotors ran cooler because of the better cooling efficiency.

 
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