(Writes through, adds quotes) * Double strikes for Ramos and Ronaldo secure 4-0 win * Dazed holders Bayern stunned by attacking onslaught * Real to face Chelsea or Atletico Madrid in the final By Brian Homewood MUNICH, April 19 (Reuters) - Real Madrid tore Bayern Munich apart with three goals in 18 astonishing first-half minutes to reach the Champions League final with a 4-0 win on a dreadful night for the holders at a stunned Allianz Arena on Tuesday. Two headers from Sergio Ramos, a breathtaking breakaway goal by Cristiano Ronaldo and a late free kick by the Portuguese forward in a one-sided semi-final, second leg handed Bayern their heaviest home defeat in European competition. Bayern, beaten 5-0 on aggregate, were impotent in attack and ragged at the back and their performance left a stain on the reputation of their former Barcelona coach Pep Guardiola. More...