[Redd]

I've used them in several cars. They work depending on the degree of your overheating problem. They will stop some heat reaching your fluid, but not all of it. So if you're starting to see fade at the end of your sessions, this may let you go an extra lap or two.

As mentioned above they also have the benefit of reducing heat to the caliper paint. When I got my Brembo GT BBK, I had it repainted Dakar Yellow to match my M3, and ran it for a year or so without Ti shims cos I didn't think I'd need them. After 2 trackdays, the caliper paint started to turn dark. I had them repainted and this time I installed Ti shims. They have been fine ever since.

My previous car was a Megane RS250 which saw extensive track time. I ran that with Ti shims from day one and the original caliper paint never turned dark for the 5 yrs I had the car.