| Arizona Z has a local machinist create rotors and hats to their specifications. They then pair those rotors and brackets with whichever Wilwood calipers you select (4-pot or 6-pot). There are a few problems inherent with selling brakes this way. One, quality control of the locally sourced products. Two, selection of the caliper and the pistons used needs to be specific to the vehicle. I'll start by saying that for my car, I selected the 4-pot calipers and left the factory rears in place. The first problem I had was with rotors included with the kit. When I installed them, they looked great but as soon as I drove the car I found that brake pulsing was dangerously excessive as a result of some flaw in the manufacturing process. I put a dial caliper on the rotors and measured the runout of the discs at .017". That may not sound like much, but 17 thousandths is HORRIBLE when it comes to rotors. I believe pulsing is usually felt with anything over 5 thousandths. The guy from Arizona Z said no big deal, just take them to a local brake lathe and have them turned. This disturbed me from the get-go because you can't turn slotted/drilled discs on a normal brake lathe, I would think someone who sells brakes should have known this. Anyhow, it took a bunch of phone calls and I finally got a new set of rotors which took care of it. The new ones had runout measuring under 5 thousandths, so no pulsing. After that was finally settled I noticed that in driving the car that the front brakes would lock up well before the rears. The car didn't really inspire confidence in anything but my ability to lock up the front brakes. I don't know for certain, but it's my opinion that this was because calipers he uses from Wilwood are off the shelf, meaning the piston sizes aren't sized specifically for the master cylinder of our Z's. I think Wilwood makes a fine product, however if I were to use them I would have to make certain that I received actual Wilwood rotors, hats, brackets and calipers that were all specificially designed for the Z, not some hobbled together kit. After going through all of this I did a lot of reading about Stoptech before I made my purchase.
I chose to go with the 332mm kit with the ST40 caliper in front and the 328mm kit with the ST28 in the rear.
Go out there and read about some of the R&D they do at Stoptech. Yes, they will use the same caliper for multiple applications, but the piston configuration of each kit is specific to the car it's designed for, and I think this is a crucial step. I was very impressed with the quality of the parts from Stoptech and the way the car felt afterwards was phenominal. It immediately made me feel more confident about braking late into the corners when tracking and never once did they exhibit a hint of fade. Needless to say they had no issues with runout on the rotors and were a perfect fit right out of the box(es). I know this sounds like a commercial for Stoptech, but it's really just how happy I was after ditching the Arizona Z kit and installing my Stoptechs. I suspect the Wilwood kit from WinFactory is a 100% Wilwood kit, which puts my mind a little more at ease. Before I would consider it I would call them and ask for the Wilwood part number of the kit and cross reference it to make sure it's a kit Wilwood designed specifically for the Z32. With all that said, my recommendation: Save your $$ for a little longer and go Stoptech, you won't regret it.
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