Like I said, both cross drilled and slotted rotors are pretty pointless for a DD. But seeing their kit comes with rotors there's nothing wrong with running em either.
Slotted rotors are gonna eat pads faster whether on a DD or track car, so if it's a strictly DD application this is just brake pads being melted away for no real reason. You def don't need the added stopping power unless like 350hp+ IMO.
Cross drilled rotors do have a tendency to crack (very rarely) under track conditions, although for a DD they'd be more than fine. And although not using the rotors in a condition where better ventilation is TRULY needed...like a track car, there's nothing wrong with better ventilation and reduced heat to a rotor no matter what application they're being used in.
And lastly, if you're on a budget with things and the full kit isn't something you can swing, just forget the rotors all together. Get yourself either some StopTech or HawkHP pads, some StopTech SS lines, and swap your fluid out. You don't need cross drilled or slotted rotors, and unless your getting vibration while braking in either the steering wheel or seat of your pants you don't need rotors at all. Not buying rotors will allow you to do what you really need, which is what I mentioned above, and also allow you to do the front AND back all at once.
And if your budget is even tighter than that, simply do the rears now and fronts later. I'd recommend swapping lines all at once though. But if you're only doing pads, lines, and fluid like I mentioned above you're prob only looking at around $350 and that includes labor. I'm guessing that's at least something you can swing though....
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