Odd tidbit about 69 GP exhaust, unlike the GTO which had exhaust selection controlled by a combination of engine determining head pipes (2 1/4” on RA and RA4 engines, 2” on others), mufflers the same on all engines and tailpipes (2 1/4” no resonators on Manual trans and 2” with resonators on automatics) determined by transmission.
The 69 GP exhaust was determined solely by engine. 400-265, 400-350 and 428 370 all had the identical 2” system with resonators but the HO had its own system with 2 1/4 head pipes, the same mufflers and 2 1/4” tailpipes without resonators..
So oddly a 428 HO automatic GP would have big tailpipes and no resonators but a RA4 automatic GTO would have the skinny pipes with resonators, contrary to what you would have expected given the market image of a GP versus a GTO.
Btw, the various tailpipes and resonators interchange between the GP and GTO but mufflers were different as were the headpipes.
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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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