^ Pretty much the argument in a nutshell.
It's my understanding though, that the holes are supposed to dissipate heat, and the grooves help to shed brake dust. But, on a street car, the biggest benefit is the "Oooooh" factor.

 

Yes, those holes and grooves look nice. But he is not going to get much life out those cheap rotors before they warp. I will still go with a good solid rotor and good pads.

 

so i guess the drilled and slotted rotors arent a good idea for my "street car" then

 

I have just stock replacement rotors on all four wheels, with ceramic pads. I'm able to lock all 4 wheels up on dry pavement, that's plenty to stop the car.

 

they may not change the performance of your car but they will definatly make it look nice which is always a bonus

 

whether it just helps cooling or they do grip better im sure either way the drilled/slotted rotors will help stop my car better from 130+mph if they didnt then drag brakes wouldnt come with drilled/slotted rotors. and those rotors should last just as long if not longer then stock replacement ones. made od the same material and are zinc plated.

 

What are you trying to say??? That group of words makes No sense.

 

im just sayin no matter who is right in this debate that theres a plus. if it just cools them thats a real good thing wen stopping from high speeds and if they grip better then even better. then i said they have to be good for something or they wouldnt be used for drag brake set ups. and that they r made of the same material as stock and are zinc plated.

 

ok that makes since.. but how often do people see those speeds here in America? Not very often from what ive seen. Could be argued that the drilled and slotted rotors are used on drag cars for weight savings also. Every little bit counts on those cars.

 

well my car should see those speeds often. weight savings is true idk how many time ive been asked y cut that off it weighes maybe half a pound. it adds up.