All the transmission and wishbones and mountings are used on the S4 from the BJ4WE, all the carbon fibre and inner steering parts are replaced with Atomic-Carbon parts.
If you have a BJ4WE the easiest way to a S4 is via the BJ4WE to S4 conversion kit, which hopefully will be available in April at £250.00
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Jonathan | Atomic-Carbon
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