Has anyone used the Happi box? Does it work and has anyone used it and seen improvments in there truck without haveing problems before the installation of the box?
Here is a look at it
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33727&item=7919230096&rd=1
Here is a look at it
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33727&item=7919230096&rd=1