There are two E320C muffler, the inlet diameter of not two, one is 70MM, one is 80MM, the order muffler inlet is 70MM, please check. FITS CAT EXCAVATOR E318C E319C E320C E321C E320CL 320C 319C 321C 318C C6.4, OTHER PARTS AVAILABLE (NEED TO BE PAID EXTRA): U BOLT , PIPE EXHAUST, TUBE , CLAMP. Replace/return are available if buyers receive wrong/damaged/defective items. Any product you return must be in the same condition you received it and in the original packaging.This item is in the category "Business & Industrial\Heavy Equipment, Parts & Attachments\Heavy Equipment Parts & Accessories\Exhausts". The seller is "parts_deals" and is located in this country: US. This item can be shipped to United States.