wow ok you guys have confused me give me a second on this.
let me know if this is correct from what i am reading thier is little i can do to increase mileage except to make sure that everthing is running in perfect condition. that assumtion excludes a complete engine redesign. with the whole air system open up and made less resrtictive

pcmenten let me know if this is right, from what you are saying i get the feeling that if i want better sound i should put in flows or what ever after the cat-back(which i assume is the catilic converter)

 

ps has anyne done some hard core reserch on engine inprovements??