JL i also ran the R1 slotted and drilled on my grand prix for a long time (over three years) and sold them with it, only downside was i think it ate pads more than usual, but nothin serious

if you want i can find you or the OP the site of were i bought mine from, again they are drilled on

on a sidenote, i actually noticed that virtually the drilled ones "look" kinda bigger, i know they are not, they just "look" bigger for some reason... or maybe its my eyes i dunno

I'm rockin' BrakeMotive drilled/slotted rotors with PowerStop Z16 Ceramic pads for the past 6 months with no problems. My only complaints are that there is an audible "whirring" sound when driving surface street speed (35 mph or less) and the aggressive compound of the ceramic pads squeal like a pig first thing in the morning.....but after a couple stops they don't squeal anymore and have great stopping power and look pretty nice too. When I first got them I painted the hats and edges of the rotors black for that added detail.

I'm running a set of slotted and drilled on my GXP and I love the looks of them, but I hate the feel of the slots and I do get some popping from the drilled holes. The really look hot, but I'd never do it again. I'm getting some pulsation after 10 months and I'm concerned about having them turned. I called a local machine shop and they'll turn them for $10 each. I'm just not convinced that they can hold up to the heat build up and the weight of this car. I've been told that a good pair of solid performace rotors would hold up much better, they just don't look nearly as HOT!

I agree with BonneGXP...I love the look of the drilled/slotted rotors but hate the noise...I never had noise with my stock setup, none, ever. Once these go I think I'll stick to some quality blanks and pads.

that bad huh?

I wouldn't say bad, I think I took for granted how quiet my stock brakes were. I never heard a peep from them and I lived in opposing extremes......in Portland, OR. for a year and in Sacramento ever since. So even in the freezing cold and constant rain of the Pacific Northwest I never had an issue with my brakes. And here in the triple digit months from June-September, never a peep.

So when I upgraded to the more stylish drilled/slotted rotors and ceramic pads I expected that I'd have the same, just with a bit more stopping power and less brake fade. The very first thing I noticed about them when I first put them on is the constant whirring sound, it'* not loud or even noticeable to most, but I can hear it and it just bugs me. Also, first thing in the morning, if it'* cold enough(45 degrees or lower), they'll squeal pretty good for the first couple stops but then after that it goes away. I guess I just got spoiled. But I honestly think the only real gain for a daily driver, using drilled and/or slotted rotors, is the visual one. I don't think a daily driver will ever truly push the brakes hard enough to really be able to materialize the benefits of having them.

I'm glad I didn't pay a premium to get this look cause I'd be pissed, I paid the same it would have cost me to get good blanks and pads so I had nothing to lose.

Never noticed any noise with mine. A bit of a feel in the peddle, but that'* about it, nothing major.

I ran R1 concepts rotors without problems on my Bonneville GXP for 42k miles without problems, then I sold the car. I loved them. I heated them to the point of complete brake fade and they never warped or cracked.

They are not prone to breaking unless you get a defective rotor or by from a cheap company or you start track racing with them.

They're excellent. I would assume you would get at least 50k miles.

Noise will depend a lot on the pad as well.

SAme here.

There was another guy on w-body.com who said the same thing; that they ate pads. We discovered he used some mediocre pads. Keep in mind pads are more important than rotors.

If you're getting popping noises, something'* wrong and its not the rotors, or you got rotors from a crappy company. They hold up to the heat. I did some very, very aggressive driving on Mulholland Drive between California'* San Fernando Valley and Malibu. There'* a movie about some racing on that road. It was a hot summer day and I heated those pads up to the point where there was a trail of smoke behind me and I lost all braking power and had to downshift. Trust me, the R1 concepts rotors take abuse.

I prefer the slotted over drilled. Slotted rotors will have more rotor surface area for the pad to bite onto, and the holes in my drilled rotors usually fill up with rust after a while. The ones on my Regal (PowerStop) have been on there for going on 105k miles now. No cracks or warping, but LOTS of abuse.

As I said before though, you need good pads, and those are more important than your rotors. The best two pads I've ever used (and I've gone through a lot) are the Bendix CT-3'* and the Akebono Pro-ACT Ultra Premiums. The CT-3'* gripped well but smoked up on very hard stops. The Akebono pads seem to be more resistant to smoking and have a longer life, but don't grip quite as hard. Not something most people would notice, but they're my personal favorites. I know that high performance semi metallic bads are better for braking, but I hate having to clean my rims every week.

For the record, R1 Concepts also have excellent service. A buddy of mine bought a set of rotors and half a year later one of them developed a hairline crack. They replaced it free of charge, didn't even ask for them back.

Mine are also R1 Concepts premium drilled & slotted, with Posi-quiet ceramic pads. Stopping power is excellent but there is some noticeable noise during hard braking. It'* not a squeal or a pop, but something a little lower like Whooooooooooooooooom. I knew that my combo would probably be a little noisy but I did it anyway because I love the way those rotors look and my wheels stay clean with ceramic pads.

Drilled rotors in the early days were just the old school cast iron ones, But these days (from R1 Concepts page): Unlike the materials that were used in the past, several metal alloys are available in today’* industry that are hardened previously and can withstand thousands of degrees in temperature.

When the fad first came out, there were alot of them fracturing. I frequent quite a few forums and have never read a reference of an R1 coming apart. Some pricier ones are now cast into the rotors.