[mirage83]

There's a bunch.

http://www.935motorsports.com/catalog/

http://www.alamomotorsports.com/

http://www.plxdevices.com/

http://www.suprasport.com/

http://www.streetperformance.com/MAR....php?show=cats

http://www.american-stitches.com/

http://importperformanceparts.net/

http://www.killersupra.com/home.php

http://www.jscspeed.com/mk3/mk3.htm

That ought to keep you busy for a while.