Acura - CL Coupe 2.2L & 2.3L 4cyl , Front - Raybestos Brake Pad

ST38- "B" slightly lower mu than ST42. Wear still not as good as ST41. Good performance over broad temperature range with minimal rotor wear.Successful in a broad range of racing series. Use in dirt where youwant less bite than ST41/ST43.

ST41- "A" the best high energy input racing material available.Extremelysuccessful in all the top three NASCAR series Raced by the 2002 NASCARChampion Tony Stewart. Maintains high mu level at extremely high temperatures without sacrificing good wear - both pad and rotor. Needs some heat to work well.

ST42- "J" lower mu than ST41 and ST43. Extremely stable average and in stopoutput over a wide temperature range. Has been very successful whenused on the rear in conjunction with 41 onthefront. Best high-temperature wear of all their materials.

ST43- Friction level and wear rate between ST41 and ST42. Stability is notquite as good as 42 but better than 41. Excellent open wheel formula.

ST44 - High friction material slightly less aggressive than ST41

ST-45Lower friction level than the ST-47 could be used as a great rear to compliment the ST-47 compound.

ST-47 Has the highest friction and torque available to date. It has been engineered for long-lasting extreme heat situations and maximum rotorlife. If you are looking for the most advanced performing road racebrake pad, that will simply out perform all the rest, this is it.