My 04 WRX (only mod is an SPT intake) started sounding like i have an aftermarket exhaust while driving today. It was fine this morning and tonight around 4 when I went to pick up a friend to head down to the Flyers game, all of a sudden the car sounds like I have no muffler. Its louder than most modified WRXs Ive heard on the road. Friends are thinking exhaust leak. Im getting under it tmr to take a better look in the day light to see if I can see any noticeable issues.... Any ideas?