Hyundai Motor Co. and its sibling Kia Motors Corp. are collectively heading for an all-time sales record of eight million this year. On the downside, Hyundai is facing serious pressure on earnings as the Korean won gains strength. That creates a disadvantage when compared to Japanese rivals who have watched earnings soar on the weak yen. Korean brands still lag well behind industry leader Toyota, which is expected to top 10 million sales this year, an industry first.