Paul,
Those are 2.50 Hooker Aero Chambers. Great sounding and awesome performing mufflers. Quiet at cruise levels with no drone inside the car, but wake right up when you walk on it.
I bought a 55 years ago that had them and fell in love with the sound of them. Been using them on every car ever since. Summit has them at $80 regular finish or $90 aluminized. I have also bought the 3" stainless in the past.