I'll chime in here with some feedback on the y-pipe. I installed mine last week with no issue and am pleased with the quality and fit. During install I elected not to use factory flange gaskets as they are smaller in diameter than the pipe and positioning them to get a good seal was questionable. This is no fault of the y-pipe since new gaskets and hardware aren't included but a better or alternative suggestion from DT for gaskets would help prepare people. I had some gaskets like blackoutt has pictured above so my install was a breeze