Both companies won't be able to help at this time. Understandably, it's impossible to design for compatibility of every third party part out there. In my opinion these are popular choices for customers and it's unfortunate that they don't work with each other.
Three options for customers right now. Don't get this combo. Mod the centerpiece. Bend the pipes but the second you do one bend nothing seems to fit and this is my last choice.
Does anyone know which headers fit the Outback Motortek crash bars? Lorry mentioned he believed Termignoni does. Has anyone mixed and matched collectors and silencers?