[Frankenschwinn]

Where do I find the black box upgrade kit for a 03 boxxer team? Is it still available?

Yess I did a search.

 

[CBJ]

Call Rock Shox.

 

[J]

You can do it yourself too. Here is the write up straight from RS's site. http://sram.com/_media/techdocs/BoxxerHC2BlackBoxUpgrade.pdf

 

[Monkeybidnezz]

I got mine from RS directly. It was pretty easy to do, and a world of difference in performance.