Install Doctor
- Car stereo installation resource. Step by step installation instructions complete with photos, tool list, and wiring detail, and a question and answer forum.
- http://www.installdr.com/

Car Amplifiers
- Provides information about installation, reviews, links to forums and brands.
- http://www.allcar-speakers-subwoofers-amplifiers.com/amplifiers.htm

Carstereo.com
- Product reviews, forum, classified ads and online store directory.
- http://www.carstereo.com

Epinions: Car Audio
- Consumer-generated reviews, buying tips and advice, ratings, price information, and searchable in a variety of ways from price to product type.
- http://www.epinions.com/elec-Car_Stereo

eBuying Guides: Car Audio
- Concentrates on where to shop for products, but also has staff-produced buying guides. Some of the guides are links to other buying guide sites.
- http://www.ebuyingguides.com/Menu/Elec22.htm