ACT Street Discs - Organic, spring center replacement disc designed for smooth engagement, quiet operation and improved durability. ACT offers the best brands for the application. When a special hybrid ACT disc is available, the suffix "S" will appear in the disc part number. This hybrid disc may use a performance organic lining or an improved hub design. The suffix "M" indicates a disc that has a reduced marcel enabling quicker action. Street discs can be used with moderate to heavy duty applications including racing depending on the torque output and heat.96dc2 on Dec/18/02 said:MD's is the SS, which is the "ACT Performance Organic Street Disc "
Modified..Hybrid Street Disc.spoonman on Dec/18/02 said:Michael Delaney,
Reguarding the ACT set up you mentioned above ist it the
"ACT Performance Organic Street Disc " or the "ACT Modified Street Disc "