Mine was sound coming from steering, i got the replacement for steering rack lucky that found out this 1 month before warranty expired. It was done by SC Glenmarie, was told that the cost is around 3k. Maybe you can check with Glenmarie.
I also having this issue, and this is due to front absorber problem need to replace, but i just leave it there as the cost need RM700 - RM800 for a pair.

Finally i got myself a KYB absorber from local store. I can say that it dramatically reduced the fishtail effect if not totally eliminate it. Before installing Ultra racing bars, I highly recommend change to this absorber first! The rear absorber costs RM95 per piece. Can get from local KYB dealers. Hope this helps anyone out there thinking how to solve the fistail issue.

KYB Part number
Front Absorber: 332n085/6 - RM135 per piece
Rear Absorber: 342n034 - RM95 per piece
I got mine from this dealer.

FONDAH AUTO SPARES SDN BHD
JLN PINGGIR OFF JLN KOLAM AIR,
JALAN IPOH, KUALA LUMPUR
TEL : 03-40419148

But you can get them from their partners nationwide.
http://www.kyb.com.my/contact-us/kyb-nationwide-partners/

Hi, any recommendation of brand for replacement of ori front & rear absorber for Elantra MD 1.6?