I'm running Project Mu HC+ with my new 240Z brake set-up -- Toyota calipers in front, Silvermine kit in back. Operating range for the pads is 0-1,400+ degrees F. During last Saturday's 90 degree day (130+ track temp) at Willow Springs raceway in 30 minute run sessions I had zero brake fade and zero noise. They're over double the cost of the Porterfields but I think 10 times better when it comes to stopping distance, consistency and wear. I ran the Porterfields last year with my stock front brakes and found them inconsistent, especially running the Auto Club Speedway roval and braking from 100+ to 30 at Turn 3. After the event, both sets were cracked. Then I changed to the Project Mu's and couldn't believe the difference. And now with vented rotors up front, I barely got them hot at Willow. Best of all, since the Project Mu's don't squeal like the Porterfields, I can drive them on the street without causing the neighborhood dogs to howl. Check 'em out. You won't ever want to run anything else again.
And you'll forget all about that extra six pounds the first time you step on your bigger brakes IF you get the proper rear brake bias. Without that balance, it doesn't matter what pad you run up front.