'Twin-Spar' Twin Stack system with central oil tank 'Twin-Spar' Twin Stack system with central oil tank 'Twin-Spar' Twin Stack system with central oil tank 'Twin-Spar' Twin Stack system with central oil tank 'Twin-Spar' Twin Stack system with central oil tank 'Twin-Spar' Twin Stack system with central oil tank 'Twin-Spar' Twin Stack system with central oil tank DAF 'Twin-bore' exhaust system DAF 'Twin-bore' exhaust system DAF 'Twin-bore' exhaust system DAF 'Twin-bore' exhaust system DAF 'Twin-bore' exhaust system 'Twin-Spar' Twin Stack exhuast system