The Kansas City Chiefs improved to 6-0 on the season and have a new record to call their own. According to the Guinness Book of World Records Arrowhead Stadium has set the world record for loudest outdoor sporting event during Sunday's win over the Oakland Raiders. The previous record lasted less than a month. The Seattle Seahawks set the record during a Sept. 16 win over the San Francisco 49ers at CenturyLink Field. The noise level was recorded at 136.6 decibels during that game breaking a two-year old record held by a Turkish soccer stadium. Kansas City ended up beating that level with 137.5 decibels.