z1 bolt on spacers installed myself. never any shaking or vibration. you're not suppose to be able to turn the spacers at all by hand. and no you get the wheels balanced separately.
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Quaife w/ gears |Stillen Gen 3|SOLD FI Resonated Test Pipes |SOLD FI 18'' | 25row Stillen Race | Progress 35mm/25mm sways | Swifts/Koni|Volk G25's| Stoptech SS lines||SPL Front/Rear Arms|
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