NEW DELHI: Car sales maintained a healthy growth trajectory in May, a month that saw the government announce the much-awaited GST duty rates that saw larger SUVs and sedans becoming cheaper even as hybrids would turn out to be expensive. While luxury makers have announced price cuts, uncertainty still remains on the direction the mainline carmakers will take in pricing. This can impact the volumes in June.Maruti, which has launched the new version of the Dzire entry sedan, said sales in the month stood at 1.3 lakh units, a 15 per cent growth over the 1.1 lakh units sold in the same month last year. The company is now ramping up production from its Gujarat plant to meet increased demand in the domestic market, while also lining up fresh investments of Rs 9,000 crore towards capacity enhancement and an engine plant. Hyundai had a relatively subdued month as its volumes were up nearly 2 per cent at 42,007 units against 41,351 units in the same month last year. Honda Cars and Mahindra & Mahindra also reported growth in volumes in May, though this comes on a weak base of the previous year.Toyota, however, had negative sales in the month as its volumes fell by 13 per cent at 10,914 units. "Innova Crysta sales has seen a slight dip as compared to the same period in 2016, which can be attributed to the fact that we launched the Innova Crysta last year during May," said N Raja, Director (Sales & Marketing) at Toyota Kirloskar Motors.Raja said that the tax rates under GST could have a negative impact on vehicle sales in June. "With the ambiguity surrounding the upcoming GST proposed tax structure, the customers are postponing their plan of purchasing the vehicle post the GST implementation. We expect this impact to magnify in June until the customers have a clear understanding of the final pricing post the GST roll out."Luxury carmakers have announced price cuts on their line-up to factor in the lower duty. However, companies are yet to hike prices of the hybrids, and it is still not clear on whether they will pass on the burden to the market."We expect the government to review the proposed tax structure, under GST, for greener vehicles such as electric, hybrid, etc, to achieve cleaner mobility solutions. We do hope the Government will continue to extend the prevailing tax benefits for greener technologies which are purely based on the fuel efficiency and eco-friendliness," Raja said.