66 Barracuda options ?

There was a couple options
Basic - radio and mirrors
Sport - wood grain steering wheel, better wheel covers and white walls 7.00 x 13
Rallye Pack was suspension - thicker torsion bars, shocks and additional leafs in the springs, front sway bar
The formual s package included the rallye pack plus the 273 commando (235 hp) and tach (instead of performance gauge) 14x4.5 on 6.95 x 14

No dual exhaust- y exhaust to a single pipe

Also - the 273 commando could be ordered by itself

Thanks . My 66 (not a Rallye or S code has had the exhaust replaced with duals. I was wondering if this was an option or just an upgraded system. I did find that Accurate Exhaust Products offers a hipo factory exhaust system for the car but it has the Y pipe as you mentioned.