egrossman

I assume you lose the pad wear sensor with the competition kit. Does it throw any codes that need to be dealt with?

JRitt@essex

That is correct. You just zip tie the pad wear sensor out of the way. The car does not throw any codes or cause any problems, so it is a pretty seamless integration of the new hardware. Thanks, and let us know if you have any other questions.

JRitt@essex

Sorry I missed this comment previously...just seeing it now. The 350mm discs are the largest front and rear that work with the stock calipers. Keep in mind that every caliper has a maximum disc diameter with which it will work properly. There are two issues at play. The first is the physical size/shape of the caliper, pad, and disc. The caliper's max disc size is determined by the arc of the caliper's disc pathway. As a disc increases in diameter, the arc of the disc essentially flattens out. If you lay a quarter next to a penny, the arc of the quarter is not as sharp. The same is true with discs. A 380mm disc has a flatter arc than 330mm disc. The arc inside the caliper body mimics the arc of the discs for which it was designed. As you try to fit larger discs, the shallow arc of the disc is going to interfere with the caliper body. Also, the pad shape used in a given caliper also mimics the arc of the disc. If you try putting a pad designed for a small disc on a very large disc, the shallow arc of the disc is going to make the pad overhang the edge of the disc in the center, while the pad will sit lower than it should as you move towards each end of the pad.
In addition to the physical size issues, brake torque is also an issue. As you increase disc diameter, you're increasing the amount of brake torque on that axle. If nothing else remains unchanged within the brake system (such as the master cylinder or caliper piston sizes), you are going to overamplify the torque output by switching to a much larger disc. That can lead to ABS issues, poor pedal feel/response, and longer-than-stock stopping distances.

In summary, both physical dimensions of each brake component and brake torque output need to be considered when moving to larger components. It's not as simple as just bolting on something larger and having it work properly.

If you move to a complete AP Racing by Essex Brake Kit, you can move to as large as 380mm front/rear. If you want something that fills the wheels, looks amazing, and surpasses the OEM 991 GT3 brake hardware in terms of looks and performance, our AP Racing by Essex Road Kit is the ticket. The discs on both the front and rear are 380mm. They make the OEM brakes look quite puny, and they're properly designed to integrate properly/seamlessly on the vehicle as described above.

Front= https://www.essexparts.com/ap-racing...-boxstercayman
Rear= https://www.essexparts.com/essex-des...91-997-718-981