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Regarding all aftermarket rotors being of equal quality to oem rotors, I would say no. Are they necessarily much worse, hard to say. But every aftermarket set of rotors I have ever tried have weighed significantly more than Toyota oem rotors, so there is obviously a considerable difference in their compositions.
I have usually found that the average aftermarket rotor wieghs about 1.5-2 lbs. more than an oem rotor. That is a significant difference, and adds to the unsprung weight of the car, which if one was being really picky, they would not want. But that is probably of little importance to many people.
I've used aftermarket cross drilled rototrs with Porterfield R4S pads, in the past, and they worked beautifully. No warm-up needed, they stopped the car on a dime, and were almost impervious to water when ocassionally driving through deep water filled ruts, etc. But they also wore out rather quickly. I only got about 35-40k out of them before they started having that warped feeling, which is not necessarily the rotors actually warping, but material build-up on them. I also noticed that very small spider cracks were starting to form around many of the cross drilled holes.
Normal rotors you could take to just about any machine shop and have them surfaced, and then get another good 15-20k out out of them. But good luck finding a shop that can surface cross drilled or slotted rotors. I've only ever know of one personally.
But hey, if their cheap enough, and you just want to try somehting new, go ahead. But regarding the 1 year warranty. It is very unlikely that you will ever encounter a problem with any rotor in that short a period, so it really doesn't amount to much.
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