New to the site, and to upgrading these. Been stuck using stock 7.3L and 6.0L's at work for years, finally got my own '03 250. Question is if the 5" exhausts are any benefit over 4" for most trucks? I don't plan on racing, sledpulling etc, probably never more than 200HP over stock even down the road. Mine was a repo and the previous exhaust stacks are mysteriously gone.