Hello i purchased my G8 in April of 2011. It had 9k on the odometer. At the current time it has 14k i recall reading a post where someone changed their mufflers and installed something called a straight pipe with a helmholtz resonator. Does anyone know anything about this? If you do please e-mail me info or pictures with dimmensions . willsanchez73@gmail.com i am thinking about changing my exhaust and any help would be greatly appreciated.