I am interested in getting this Unorthodox Racing Ultra SS Puley Set for my 2003 Subaru Impreza 2.5RS (bugeyed). Has anyone done this before? What kind of performance gains did you receive? I heard it doesn't affect the sound system if I ahve alot of aftermarket things running through it. Is this true? I want to amke sure everything runs proeprly while im runing these? ANd also any other input would be great! Thank you!