I would say initially you can get by without replacing all 8 but when the stock bushings wear out I wouldn't put another stock one back in. I like johnny joints.
This was my right side upper control arm bushing that's mounted on the front axle. Completely blown out after maybe 8k miles of light wheeling but lots of flex on the bolt on coilovers.
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After
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I would eventually like to do the evo long arm but might change my mind if they release the short arms.