Moved to Suspension forum. Out of what you list I would drop the number 1 item. Don't think it's really needed on an STi. I had a copy on mine and sold it and haven't looked back. I'd replace it with an X-brace in a heartbeat or TiC fender braces either of which offer more bang for the buck in my humble opinion. (Suspension/handling junkie right here-Lucille is now on rails)