I too have refoamed my OEM subwoofers after reading Pioneer4x4 post, not too difficult. It made a huge difference in the stock sound system. When I took the speakers out the original foam looked OK, but close examination revealed a crack all the way around the speaker between the frame and cone. I bought directly from Simplyspeakers.com. Their standard kit FSK-6P206 is an exact replacement for our subwoofer speakers $24.95. I also used their foam sealer, but warn that you can distort the new foam if you screw the gasket directly through the new foam as they show on their video site. I recommend you use an ice pick or similar tool to force a hole through the foam [I]AND[I] lightly lubricate the screw for the gasket with oil before attempting to tighten the gasket in place on the new foam. This is especially important if you use their foam sealer.