Subaru Impreza Prodrive exhaust 2nd downpipe GDA GDB OEM BUGEYE BLOBEYE. Here we have a 2nd part of the downpipe. This is a resonated pipe that connects too the top half of your down pipe, there is no cat inside just a resonated part to look like a cat is in place while still passing mot emissions. This replaces the 2nd cat with a resonated pipe, which improves performance and gives better flow.