fnugen

Being new to Subaru, I was elated to find a sub-forum such as this. I did notice the first 2 links are dead. Not knowing exactly what they do for performance, or mileage, can I get a head's up on them?? they are 1) Intake Silencer removal http://legacygt.com/forums/showthread.php?t=1955 2) Exhaust silencer removal & replacement http://legacygt.com/forums/showthread.php?t=3741 Do these give the car a more powerful sound, or just add a more ROAR sound as if it has a cone filter setup (P-flow) ??