I changed to a Whiteline rear arb (22mm I think) on my Hawk and some alloy drop links too, and it makes a lot of difference to the handling for the money. The car turns in much better than it did before before...
The thicker the bar, the stiffer it will be. Mine is 'adjustable' - three holes on each end, one for soft, one for medium, one for hard. I have it on the medium setting.
J.
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Currently very broken Hawkeye WRX 
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