although not run on an S2, i ran one on my X-6 and took it off after 1 meeting - absolute rubbish !!. the plastic pivot bushes were really badly worn after 5 runs giving loads of play in the front arms.
i went back to the std plastic bulkhead straight away - i don't know why i changed it as its never given me any grief in 3 years on both the B4 and X-6.
if you want an alloy bulkhead i suggest the k-factory version (more money but much better quality)
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