Brothers of Boom to fire both barrels, tips Gollan Millionaire siblings Temple Of Boom and Spirit Of Boom might have outside gates and be wide in the betting but trainer Tony Gollan warned they "will keep the good ones honest" in Saturday's BTC Cup at Eagle Farm. The pair are out of Temple Spirit and have showed up against the best. "It is funny when you look at it - Temple has won a group 1 [in the 2012 Galaxy] but Spirit has always had the bigger boom on him," Gollan said. They have both been great horses year in, year out, and they are never far away in these types of races. You don't get too many out of the same mare which earn more than $1 million. They are more tradesman-like than the glamorous siblings Black Caviar and All Too Hard. Spirit Of Boom is the younger and remains an entire by Queensland-based Sequalo, so a win on Saturday would help his stud future. He has been freshened up for a campaign in his home state after group 1 placings in the Winterbottom Stakes in Perth and, later, the Oakleigh Plate at Caulfield. "He chased very hard behind Buffering when he wasn't quite ready," Gollan said. The challenge has been a little harder for Temple Of Boom, a six-year-old son of Piccolo, which was beaten seven lengths when last in the Victory Stakes. "They needed [those runs] a couple of weeks ago and you are going to see massive improvement," Gollan said.