your thread is confusing to read, I don't know what you already own, and what you need?
Also the "Mugen" front lip it was never made for 2002-2004, they have the full front bumper though. What you have is probably a Aspec or ITR front lip.
Anyways I got a RSX auto also

so no shame here!
If you like I can give you the contacts to the guy that did my retrofits / HIDs on my RSX. He is also certified to do all custom audio/video installs. If you want to know more about my RSX you are welcome to ask me any questions.
BTW if you looking to use Koni yellows and Springs, might as well spend money on coilovers, you can get Skunk coilovers for around 900 buxs or you get better Tein Basics for 1200 buxs. Why switch out H&R springs for Tein S? They are just pretty much the same, Tein S might give you a lower drop though, but the cost for reinstalling them might not worth it? Both are good top brands, not like you are swapping the Teins for some Ebay springs.
Also I don't know what you mean by 15% tint for all those cars you listed, but for the RSX look out for the dot matrix issue that we all run into.