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Rotora is based out of Taiwan. They don't make bad products actually. They are much more popular in Asian then in North America.
The 4.8is has a 355mm rotor and is a single piston set up, its a very large single piston.
As for slotted or drilled, since the car is not seeing track duty, I don't think it will make much diff. Some drilled rotors can develop small cracks. I had drilled rotors(Brembo) which saw 6 or 7 track days, plus every day use and had zero issues. So get which every you like the most. I would say get slotted if you are going to track it.
If you want a Brembo kit, I think you will need at least 19s to clear the fronts, as the rotor is 385mm and its a 8 piston set up. If you want good pricing, I can suggest a few ppl, there are a lot of good retailers in SoCal.
Stoptech kit is nice also, and their replacement parts are much cheaper then Brembos, but the kit is smaller overall, but Im sure it will perform just fine. The other added advantage here is that you will see some weight saving also, as Stoptechs are Brembos tend to be lighter then OEM systems which weight a ton. So it might help your steering also.
Dave Z is the man to see if you want the Stoptech kit.
The other option, if you are looking to just get some better performance. Contact Dave Z, and get some better pads, some SS lines, and better brake fluid. I did this the first week I picked up my 4.8is.
Good luck.
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