2002-05 Owners. As of August 2022 there is now an entire suspension kit for sale! Scroll down to the bottom of the first post click here.
I'm looking to do the same. Have a new Pioneer system but no real good place for the antenna. Guess you could mount it up on the dash. Just have the cords running in plane view. Another thought was to run the wires thought the third brake light mount and use a magnetic base antenna.
Just had a chat with the Pioneer folks about the where and maybes of installing my antenna. I've selected routing the line behind the passenger glove box then up along the seem of the trim pieces to a point by the defrost vent. Antenna lead is hidden and my antenna blends in with the black dash board. Being on the right side it will pretty much be out of sight, out of mind