3244157 3244172 MUFFLER AS E320D E320DL, AFTERMARKET REPLACEMENT PARTS. CAT EXCAVATOR E320D E320DL, OTHER PARTS AVAILABLE (NEED TO BE PAID EXTRA): U BOLT , PIPE EXHAUST, TUBE , CLAMP. MOTTROL(USA) EXCAVATOR PARTS DEPOT. YOUR BEST SOURCE FOR OEM QUALITY EXCAVATOR PARTS. For the parts described with both part number and application machine model or engine model, please make sure to order according to the part number, the application machine model or engine model is just for reference.