Would a 66 impala dual exhaust system be the same as a 66 Parisienne?
I'll go out on a limb and say yes they are.
....with some local or manufacturing differences.
1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
