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BL = Body Length OA = Over-all Length ID = Internal Dimension OD = Outside Dimension This muffler is designed to sit transverse under the vehicle. The body is round with a 6" diameter. The BL is 25¾" with an OA of 31". There is a single inlet at 2"ID and dual outlets at 1¾"ID. Muffler being sold "as is" and is non-returnable, non-refundable. This part will generally ship within 1 wk.