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Karl, there are several answers to your question and since I am probably the builder and know who the owner is I am uniquely qualified to answer. I am also the largest dealer of Wilwood in AZ.
There are a couple of things you need to understand about an FFR right off the bat. The car is 55% rear weight bias and requires much more rear brake than a Mustang or most other manufacturers of replicas. Any single piston rear system is totally inadaquate and I have tried them all. It is much easier to dial back to much rear brake than to try and get more out of an inadaquate syetem.
The front system used was directly related to the wheels that were used on the car. The 6 piston system that I prefer will not fit inter these wheels. It isn't the rotor size, it's the size of the caliper. The caliper needs 1 5/8" of clearance from the bolt face of the wheel to the spokes of the wheel. The wheel used on the car has about 1/2". Way to little to clear even with a large spacer. The option of an 11" 4 piston system that is $700 less expensive than the 6 piston was used because the 12.19" system was discontinued by Wilwood and was not avalable at that time.
Since then Wilwood has been making that kit specifically for Levy Racing and is only available through me. This kit was later added to that car as an upgrade over the 11" kit. There is nothing wrong with the 11" kit. I have and know of quite a few people that raced this kit with no issues what so ever.
I did discount the Kit by over $200 as well as discounted the labor. We also did a number of maintainance checks on the car at no charge.
Also the car did not leave the shop with the studs loose. They were all torqued to spec with red locktight. Concidering that the upgrade was done over 9 months ago the causes could be a number of things.
I hope this answers your questions. We have been around longer than anyone else related to these cars and will continue to be here.
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