Pete,
The muffler appears to be a TH12x1A TurboHeader for the Saito 100 and others. The Saito 80 uses the TH12x1B that has a ring machined in the neck to tell them apart. It will probably work okay but you will not get your best performance if it is the A model. Thanks for picking up one of our TurboHeaders. Send me a message if you have questions. You found a great bargain.