MotorKing 4549 Engine Mount (MK Front (Fits Honda Civic Si, Acura RSX)) OE grade virgin material resists vibration, exhaust heat, and solvents that cause premature breakdown of Inferior rubber materials Rubber durometer matches OE ensuring maximum occupant comfort due to minimal transfer of vibration frequency at all engine RPM's OE or better coatings resist corrosive effects of road salt, solvents, radiant exhaust heat, and other damaging factors in harsh under car environment