Hi, I can honestly say that the atomic rear tower is a must with the extra holes ABOVE the original holes, 'TIVVY SPEC', as well as limiting droop to an acceptable level the main benefit is the UP-TRAVEL you gain as this stops the car flipping mid-corner as it runs out of 'LEAN'. For curiosity i placed my ZX5 next to a XX-4 and with atomic tower on there is little in it geometry wise.
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