THIS KIT INCLUDES 4 SCREWS, 1 SPARK ARRESTOR SCREEN, 1 DUAL PORT MUFFLER SHEILD. DID I MENTION NEW MUFFLER IS NOT INCLUDED. The item "CUSTOM DUAL PORT MUFFLER KIT FITS STIHL CHAINSAW MS661 - UP522" is in sale since Thursday, January 12, 2017.This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Chainsaw Parts & Accs". The seller is "customchainsawparts" and is located in Arlington, Washington. This item can be shipped worldwide.