[ideola]

@Kroggers
Thanks, that's a great question, and I should have included that info in the general background above! As sc_rufctr notes, these bolts are absolutely re-usable, and that is one of the biggest advantages. The thing to remember is that for ALL of the OEM applications, stretch bolts are used, and therefore require new replacements after EACH time the bolts are "de-torqued". On a track car, that is less than practical, even if the cost of OEM bolts is less than $1 each; just the nuisance of having to have a ready supply sitting around. These bolts are NOT stretch bolts, and are therefore re-usable. Even if you're not convinced of the failure risk, the simple convenience of being able to reuse the bolts and not have to mess with safety wire seems compelling enough to make these worthwhile.

@Jeff Alton
YES! People ARE breaking the factory bolts, and here's why. As best I can tell, failures are due to a two primary issues: 1) re-use of OEM bolts (which one could argue constitutes improper installation); and 2) contaminated threads on either the bolts or the stub axles (CV grease is not conducive to maintaining torque). So unless you're working in a "white room" type environment, there is a fair chance that the threads will be contaminated, particularly in a pit environment. Once an OEM bolt loses torque, either from being stretched or from grease contamination, it (and it's neighbors) will inevitably back out. Some will fall out entirely, and some may snap off due to the increased load. I don't see anything in the 928 design that makes it any less susceptible to these failure modes than the other cars.

I have received countless emails and PMs from guys, even on street-driven cars, that have shared anecdotal stories about CV bolts backing out...if one of them loses torque it puts extra stress on its neighbors, and that's what cause them to break. These bolts are a stronger grade, so not only do they not back out, but they are less likely to break as well.