im new on this thing...but does n e one know the size of the rear speaker of the 1998 GS300? its juss one speaker (sub?) and im thinkin of changin it but cant figure out the size...no description in owners manual and nothing on the speaker itself...if n e one knows then help me out...im dyin to get this car to look and sound better...any additional info on how to make it sound better would help lots...thanx