Except for serious and lengthy off-road trips, the remote reservoirs are not necessary--the RX 9000's will improve your off and on road comfort.
They look cool though.
The panhard rod is a good buy as are the SMA trailing arms. I have a similar set on my H2. Again, they are a good items for off road.
Get the airraid system will improve performance---drive it a while until the computer adjusts.
I see no need to replace the filter only--if you do not want the kit, them stay stock.
Hope this opinion helps--you will get many more on here that may differ from my opinion.
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