Pedro's throttle body and re-flash.
Under drive pulley
RoW new suspension 2011
Pedro's brace.
Installed Bose + new speakers and 700W stereo.
15mm spacers.
Interior re-freshed.
New roof in 2008
BMC air filter
To comment on your posts, this is my 3rd Boxster. I started with a highly optioned 2001 base then a 2001 S. This 2004 SE far nicer inside but it's still a 986. All drove the same just power difference.
In my opinion because of all the extras they put in an SE it's worth more than a 2004 S, how much is debatable but I'd say $2000-$4000.