Be happy the nissan guys are being nice as hell to you. usually they are assholes to anyone who asks a retarded noob question. everything you asked could be found simply by searching here on tr or on nico.
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RIP my very best friend. DJ aka djzstang1 you will be missed dearly. I love you bro.

1995 240sx se
1992 240sx
1990 240sx se
1991 240sx hicas sr20det MDX
1991 240sx project coupe
1990 240sx drift beater hatch
1993 240sx sr20det