Per shop books, parts books and sales literature only Starfire and Jetstar I had the chambered/resonator exhaust. Ninety Eight and S88 with Starfire engines used regular mufflers and rear resonators. That's not saying you couldn't put them on a Ninety Eight.
Did you use the Sweet-Thunder Starfire chambered sections? What did you use for front resonators? Took me years to find a GM pair; I had picked up a couple sets of InParCo which I'll hang on to, but wanted NOS GM if I could find them. I expected the car to be "barky" with the chambered pipes, but it's remarkably quiet unless you romp it.
65 Starfires could have M40 TurboHydraMatic or M20 Saginaw 4-speed unit.
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Glenn Williamson
Rocketraider
member AACA and all major Olds clubs
1964 Starfire, 1969 Toronado, 1974 Hurst/Olds, 1976 Ninety Eight
There's a Dodge K-Car and a Ford truck hiding in there too! Hey, ya gotta have something to beat around in...