2003 WRX. A have this really wierd sloshing/slurping noise. It occurs when I take off in first gear and then tames down when revs go up or the engine noise over come it. Does not happen in reverse. And will sometime do it when free reving the engine with no load. It does not do it consistantly at all in any of those case though. I have no CEL. The sound can only be heard when inside the car. Does anyone know what this sound might be or has encounted this noise.