i'm looking to add an intake and exhasut to my dads '01 7.3 for chritmas and need some opinions. i'm thinking of going with the afe stage 1 intake, but am unsure about exahust. he has the superchips max micro tuner which he loves and he really doesn't want to change anything but i think he needs a 4 in. exhast and intake atleast to help it breath a little eaiser. but what would be the best setup for a quiet stainless steal exhast. i don't know to much about the powerstrokes so any help and additonl info would be a lot of help Thanks!