RFX Race Series Bulk Sound Deadener - 500kg RFX Race Series Bulk Sound Deadener - 500kg The RFX Race Series Exhaust Gasket is the perfect replacement for 2T and 4T exhausts that have lost their gasket and become noisy. The loose fibers are woven together into long strands and are easy to install in any muffler. The RFX exhaust seal is suitable for temperatures up to 700°C. Manufactured to high specifications for extreme heat resistance. Ideal for reducing noise and reconstructing the exhaust. For best results, do not overfill. Wrap the gasket snugly, but not too tightly. The final seal should feel like a firm cushion. If the gasket is wrapped too tightly, it will actually increase the noise level. NB as professional sellers we can issue a regular invoice if expressly requested in the not.