I definitely advice to fit Schumacher Cat SX front wishbones. I tried them during my last race with XX4 on very tricky indoor track in Wien. I broke 3 Crashback wishbones before those from Schuey and then none. My dad modified his XX4 to Schuey after few breakages and he's fine since. Definitely don't forget to do front brace mod or you'll end up with broken front bulkhead.
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