Thanks, @webby . That write-up by Vit Viper was extremely helpful. If the RBC and all of that are supporting mods and don't really do anything by themselves, then I think I'll continue on finding things to lighten. @sunofwolf It's fine for the street-- mine has a 4.5'' diameter muffler opening. The cabin drone is pretty pronounced before it breaks in, so no radio for like 2-3 weeks. I'm also having to replace things as my car continues to age--it's fun to swap in slightly nicer than OEM stuff. The next thing I'm gonna do is the rear shocks. I have some KYBs on order. I was gonna do that JDM bumper swap-- but I got to see one in person. Big NO.