Nov 25 Argentina's automakers said on Wednesday the reforms promised by president-elect Mauricio Macri would take a while to bear fruit in Latin America's third largest economy and they expected their sector to remain stagnant throughout the first half of 2016.<br />Argentina's car industry has struggled in recent years due a stagnant domestic economy and a regional slowdown, particularly in main trading partner Brazil.<br />Further challenges under President Cristina Fernandez were an overinflated currency, additional tax on luxury cars and trade controls that have made it hard to import necessary parts for manufacturing.<br />Macri, who won Sunday's presidential election, has promised to reboot the domestic economy by dismantling outgoing Fernandez's web of protectionist controls, cutting taxes and freeing up the peso.