The words horses for courses apply here...you want an installer who can set up the coilovers to height requested and do a good wheel alignment to take advantage of them. Getting this right will determine how long your tyres last and how you back feels to a greater or lesser degree. I recommend Wheels World in Carbon Ct Osborne Park or Stechnic in Maddington. Check out the vendors section here for suppliers of coilovers.

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Funny looking German Subaru