Port size is 7/8" ID, so one port and you're good to go.
Muffler contains no spark arresters.
Rubber plug is included to close port when necessary.
NO BAFFLING.
International shipping to many countries.
Fast Priority Mail Shipping.
I have been producing and selling performance based high flow chainsaw mufflers since 2018.
If any of my mufflers fail for any reason due to my workmanship, I will repair or replace it to the original purchaser free of charge. Buyer pays return shipping only.
If you have any questions, please ask.
Thank you for your interest.