G'day I wanted to know how to find out my sw20s build number any help would be appreciated. The frame is.

Sw20 0032232

Your build number is 32,232

It is simply the frame number :P

Lol, I don't think it unless they built 32,000 cars in 1990 alone, I now the first 2 digits are the month it was built that was November

According to the book I have on the history of the MR2, 1990 was actually the year when the greatest number of SW20's were built. It says there were 45,424.
 
1984 > 14,677
1985 > 51, 271
1986 > 42,506
1987 > 26,368
1988 > 18,129
1989 > 13,153
1990 > 45,424
1991 > 31,603
1992 > 19,897
1993 > 11,981
1994 > 10,039
1995 > 5477
1996 > 3309
1997 > 2466
1998 > 2481
1999 > 5641
 
Total production : 304,422
 
(Toyota MR2 Coupes & Spyders by Brian Long ; http://books.google.com.au/books/about/Toyota_MR2.html?id=iNsCAAAACAAJ&redir_esc=y  )
 
For those of us with Gen 3's, the tiny global build numbers make you realise that you actually own something of a rarity!