Exterior Parts & Accessories. Interior Parts & Accessories. Heavy Equipment Parts & Access. Engines & Engine Parts. Exhaust Manifold 3970066 for cummins diesel engine. OE:Part Number: 3970066. This item fits for Cummins 6BT5.9 6BT 6BTAA 5.9L 6BT B5.9L Engine. Please make sure it will fit your machine before purchasing it. If you are not 100% sure this is what you need, please find out your engine model, series number and contact our Customer-service. If you have any questions or would like to know if the product is suitable for your machine, please provide us with your engine nameplate and serial number and we will confirm this for you. Please check pictures for more details. Communication is the best way to solve the problem. Australia & New Zealand. During this period, we will be obliged to provide a brand new replacement for the quality issue you encounter. Feedback is very important to us. So that we can satisfactorily address your concerns.