** Shares of auto parts provider ARB Corp ARB.AX falls as much as 4.4% to A$18.02, their biggest intraday pct loss since April 20

** Peer Super Retail GroupSUL.AX set plans to increase store portfolio from 790 to over 900 by 2031

** Citi sees competition increasing for ARB due to expansion of Supercheap Auto’s product range

** Shares hit lowest level since June 4

** YTD, ARB down 42%