the 8thgen decklid and wing spoilers were actually sold as a kit that came with different trunk torsion springs to offset the additional weight. If Honda doesnt make them available maybe getting the torsion springs from a 9th gen Si would fix the problem
its an interesting change, i like that the stereo for non navi models looks a little less out of place. The look of the 2012 non navi stereo always struck me as a little odd
but that was related to a swap from hybrid to non hybrid models, if r18 models are getting the auto climate it still wont be plug and play, but the necessary parts will be more readily available