i prty shur that the JDM Silvia and the JDM 180SX have the same parts, except some body parts.
as far as the factory Special Edition Sil-80, i've been told that it had a "sportier" suspension. probably to attract the younger ppl into drifting right away. j/k. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='
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i don't kno much about suspension tuning, but what i do kno is that the more u make the suspension "race-ready", the less it'll be "road-ready". the factory suspension was made to be forgiving, so that it can be sold to the ordinary joe schmoe. the more u improve it, the less forgiving it'll be. that could be might not matter depending on whur u live, but it LA, it really makes a difference.