Power Modules

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Whats the story with the "Plug in performance modules(venom, etc)?" they say they give 20% more HP but I talked to a mechanical engineer in pheonix who works on wierd ecu problems for a living and he said that putting a plugin module like that will f--- up an ecu

anybody know any different
they are worthless

hondata, aem, power FC, haltek, and link are the only ones really worth doing