Finally completed the custom Catback for my vehicle. Overall satisfied with the sound. Minimal to no drone. System sounds way enhanced. 2.5” Megan ldp to Megan y pipe 2.5 inch with 3 inch outlet to y collector 3 inch to to flowmaster single inlet 3 inch and dual outlet 2.5 inch to 2.5 inch piping back to plm axleback. Overall satisfied to get some more flow in the exhaust system. Check out dj mufflers and exhaust especially if you live in md . Right off of Solomon’s island Calvert county md .