Bluestuff NDX is a high friction sport and race material that can be used for aggressive street driving and certain types of track use. The material has had much success on the track with quality aftermarket calipers (Multi piston systems with better release and cooling and larger rotors) and limited success with street based calipers where pad size and caliper drag can challenge any brake material. The biggest advantage of EBC Bluestuff NDX is their bite from cold and progressive brake feel and the ability to bring a car to a complete stop. This has led to the ECE R90 brake safety regulation approval of R90 which is now completed and certificates are being obtained (during July 2011). There are certain older street based caliper systems where even the new Bluestuff will have trouble handling the caliper and slider drag inherent in the systems but this scenario is exactly the same for our competitors. There is NO material that will be PERFECT on the track in all older street based caliper systems. Bluestuff NDX Full Race Brake Pads; FMSI Pad No. D737; Vented; 5 Bolt Holes; 298mm Dia.; 67mm Height; 24mm Thick; 98.1mm Center Hole Dia.; Fitment: 1997 Porsche Boxster Base 1998 Porsche Boxster Base 1999 Porsche Boxster Base 2000 Porsche Boxster Roadster 2001 Porsche Boxster Roadster 2002 Porsche Boxster Roadster 2003 Porsche Boxster Roadster 2004 Porsche Boxster Base 2005 Porsche Boxster Base 2006 Porsche Boxster Base 2007 Porsche Boxster Base 2007 Porsche Cayman Base 2008 Porsche Boxster Base 2008 Porsche Boxster Limited Edition 2008 Porsche Cayman Base