Colin Kaepernick and the San Francisco 49ers have conquered the bitter cold of Green Bay and the travails of a cross-country flight to Carolina.Now they face their toughest test yet to get back to the Super Bowl: the deafening noise of Seattle's 12th man home crowd and that swarming Seahawks defense that thoroughly shut down the reigning NFC champion Niners in Week 2."Our team has been in a lot of good primers, been through a lot of situations, been through tough environments, whether it be weather or opposing stadiums," coach Jim Harbaugh said Monday. "This team has been in a lot of situations. Been everywhere, man. Just like something from a Johnny Cash song, 'We've been everywhere man.'"In what has emerged as arguably the NFL's best rivalry, San Francisco is on an impressive roll riding an eight-game winning streak as it returns to the Pacific Northwest for Sunday's NFC title game — the 49ers' third in as many years.It's the trip everyone has envisioned for months now since it became clear Seattle would win the NFC West and secure the No. 1 seed."Long story short: They know us, we know them," linebacker NaVorro Bowman said. "We got to go...