METAIRIE, La. -- Over the past eight years, few offenses in the NFL have attacked and overwhelmed their opponents quite like the New Orleans Saints.And during that span, few defenses have attacked and overwhelmed the Saints quite like the San Francisco 49ers.When they meet this Sunday in the Mercedes-Benz Superdome, the 49ers (6-3) will try to knock off the Saints (7-2) for the third consecutive year.The 49ers' physical, attacking defense has forced a combined seven turnovers and eight sacks in those two games (a 36-32 playoff victory after the 2011 season at San Francisco and a 31-21 regular-season victory last year in the Superdome).