Super Gold (the clear-ish stuff) works VERY well.......I use it in my 928 on the track, running otherwise stock brakes & never have a problem....towards the end of sessions the pedal does drop a tiny bit, but still has power.... The 928 weighs just slightly less than the M3 & has about 80hp less with slightly more torque...but only has 12" 4 piston Brembos all the way around....
2008 E92 M3, MR, DCT, extended BB leather, loaded!
1988 Porsche 928S4, Guards red/Champagne leather
1989 Porsche 928S4 track beast!!!