[s-type] Increasing Performance?

in general, what are the ways one can increase performance (hp,
handling, etc.). There is a good (albeit dated) article on how to
do this for an XJS:

http://www.jcna.com/library/tech/tech0010.html

I’d like to find a similar article or recommendations for my 2003 S-
Type V8.–
2003 S-Type V8
Dallas, TX, United States
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