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L490-1212S4S 4 inch Elbow 90 Degree 12 inch x 12 inch OD-OD 409 Stainless Steel L490-1212S4S What other exhaust parts will I need Depending on your current exhaust system, you could need several truck pipes to complete the job. If you are needing to find out what OEM pipe fits your truck, It is best to call a Dealer in your area and provide them with your VIN#. Your entire exhaust systems purpose is to get the engine gas fumes from the engine to the outside air using many different types of pipes.Depending on your overall system design, the exhaust gas will flow through a wide array of exhaust parts below: 30 Degree Elbows 45 Degree Elbows 60 Degree Elbows 90 Degree Elbows Flex Exhaust Hoses Stack Pipes Chrome Stack Pipes Aluminized Clamps Reducers/Connectors How do I choose the Type of Ends I need When purchasing Exhaust Components, please make sure that you are getting the right size and have the Ends figured correctly. ID = Inside Diameter OD = Outside Diameter You can think of the pipe with an ID end as being the Female end of the Pipe, and the OD ended pipe being the Male. The OD will fit inside of the ID. NOTE: Dont forget you