Hotrod Hotties
- Sells air fresheners, keychains, window stickers, t-shirts and posters.
- http://www.hotrodhotties.com/

Hi Volume
- Offers car audio and performance products. Includes help for new customers and ordering details.
- http://www.hivolume.com/

Hyperformance Automotive Center
- Offers air intakes, drive train, electronics, lighting, suspension, and fuel and components for sports compact, truck and domestic models.
- http://www.hyperformanceauto.com/

Helton
- Sells heat exchangers for hot showers and water supply, designed for camping enthusiasts.
- http://www.helton.com.au/

Harrys Hot Rod
- Sells cooling, driveline, suspension, ignition and lighting parts for cars and trucks.
- http://www.harrysautotruck.com/

Hi-Way Oil Service Inc.
- Small selection of accessories for sale online.
- http://www.autosupplies.org/

Hydrogen Boost
- Offers a gas mileage enhancement system based on hydrogen gas generator.
- http://www.hydrogen-boost.com/

Honest Johns
- Suppliers of quality tools, parts, entertainment and car care products.
- http://www.honest-johns.co.uk/