Sites that give detailed instructions on modifying CB radios include DTBRadio.com, hardtimez99.com, CBRadiomagazine.com and 714xpress.net. The mods include increasing transmission power or supertuning, adding channels and fixing perceived design flaws.
Sites generally offer these radio mods with warnings or disclaimers. Changes to a CB radio should be done by competent technicians to avoid the risk of damage to equipment, and mods may not work on all radios. Changes to operating power may put the radio in violation of federal or state regulations. The website providers offer the information for educational purposes only and take no further responsibility.
In online forums, technicians offer the suggestion that purchasing a power microphone and properly tuning the antenna are the most cost-effective modifications for CB radios.