Originally Posted by Max Capacity
Take the mufflers off and drive the car. See if the sounds still there.
Sorry I just found this thread, you should have emailed me. My wagon is catless, stock exhaust from the DP back, with 2 washers between the Y pipe flange and the mufflers.
Some have said the exhaust tips may be to short also, they may need to be further past the bumper.
My Spec has stock exhuast less mufflers, no drone. The tips on the muffler deletes extend a bit further then stock.
I would have emailed. It doesn't sound like its coming from the back of the car though. its more towards the engine. I guess the best way to figure out what's going on is to get it on a lift and see if air is coming out of any part of the exhaust