* Q4 net profit seen up 7.5 pct to $2 bln * Outlook dampened by currency moves, competition, home market * Hyundai gains in China as Japanese rivals struggle By Hyunjoo Jin SEOUL, Jan 24 (Reuters) - Hyundai Motor will report its lowest profit growth since it switched accounting rules in 2011, as record car sales are dented by the impact of a stronger local currency and the cost of compensating drivers in North America for overstated fuel-economy claims.