The Sensex opened with a positive gap of 49 points at 13,163 on the back of strong Infosys numbers. Despite weakness in other Asian markets the index surged to higher levels backed by aggressive buying in technology stocks.More good news came in from the inflation front which dropped below the 6%-mark to 5.74%. Stocks from auto, banking and metal sector joined the party which led the index rally to a high of 13,421. The Sensex ended with a solid gain of 270 points (2%) at 13,384.