I've been using Project Mu HC+ 800 pads and Dot 5.1 on my otherwise stock GT86 (unless you call an oil pressure gauge a mod). I make the front brakes smoke regularly, but no fade or soggy pedal after 20mins on track.
I get juddering due to this 'scarring' on the disc. Few 100 miles of street driving sorts it out usually.
Oh yeah, dont use 300C caliper paint either. It burns
