Modifications/Add-Ons Links
CV Carburetor Modifications
http://nightrider.com/biketech/hd_cv_mods.htm#main_jet
Excellent description of how to modify a stock carburetor to get better performance from your bike. Awesome pictures included.
Mustang Motorcycle Products, Inc.
http://www.mustangseats.com/
This company makes great aftermarket seats. Very comfortable. Ask about them at your local Harley shop.
Pipe Dreamz
http://www.pipedreamz.biz/
They have a big selection of aftermarket pipes for the Sportster models. Note: These pipes are illegal for street use (whatever that means).
Seeger Cycle
http://www.seegercycle.com/
There is a kit available from here that makes it super easy to turn a Sportster into a chopper.
Riders Passion
http://www.riderspassion.com/index.php
Another place for accessories. They specialize in motorcycle clocks and LED lighting kits.
Motorcycle Superstore
http://www.motorcycle-superstore.com/
A lot of accessories for all types of bikes/riders.
Cycle Gear
http://www.cyclegear.com/
I frequent this place a lot. It is nice to try on a helmet for size and appearance, as well as goggles, jackets, etc. They also have stuff to help you maintain your bike like motorcycle jacks, oil, etc.