 Here is a link with its history. You probally already know about them though since you have one. [ http://www.needelsischeating.net/tenshi/sileighty.html ]
BTW s13 is just the chasis, used on multiple cars. You technically have a "s13 240sx with the "s13 silvia" front end and a "s13 180sx" drivetrain.
(i use to have a 240 too).

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