GKTech - CLEAR SR20DET CAS COVERDirect replacement of the standard item Light weight Durable design for the roughest conditions Designed for race use CAS not included Gasket not included (optional) Gasket: A common problem with the SR20DET is the CAS cover gasket is often damaged or has expanded with age. Nissan don't sell the CAS cover gasket on its own which means to replace this part you'd need to buy a complete new CAS at a cost of $600+ We have made our own replacement specific