The WRX08-RFL or Really F#$%!@ Loud is designed specifically for the owner of a 2008+ WRX who wants a vent to atmosphere blow off valve. This is the loudest valve on the market at 115 db at 15 psi. Not only does it look and sound much better than the stock plastic valve with it's polished/anodized aluminum finish, the WRX08-RFL adds function and can hold whatever massive boost pressure you want to run.