Resonators were standard issue on almost all full-size Pontiacs in that era. Many A bodies had them too but it varied by year, trans and engines (68 tuning pipes for example) and typically only on dual exhaust. Even first gen Firebirds had resonators when equipped with dual exhaust (although in that case they are ahead of the muffler).
Back to full-size cars there were several versions in the 65-70 generation: wagons had a unique set up with the resonators being mounted diagonally on the axle crossover, the long wheelbase cars have longer resonators than the standard wheelbase cars. There were a few different diameter tailpipes associated to them; single exhaust and HO cars typically had 2.25” and non HO cars had either 2” or in some cases 1.75”.
69 GP’s had them except with 428 HO, 69 GTO and LeMans-Tempest had them except for manual trans GTO and single exhaust
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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