273 Commando or Not?

If its not a Formula S the two holes in the fenders maybe for the "Commando V8" emblem...If my mmemory serves me correct the two holes for the Formual S emblem are vertical not horizontal like yours. Have to check my car to be sure. Anyway below excerpt is from Car Life Magazie, June 1965.

The Formula S was a special option package available
starting in 1965 and was available through 1969, (although it lost it handling/sporting roots from 1967 on, just like the later Shelby Mustangs.) It consisted of the following optional equipment:

* Commando 273 4bbl V8 engine, 235 rated BHP

* Heavy duty rear springs (6 leaf, 115 lb spring rate)

*Heavy duty front torsion bars (0.87 inch dia)

* Front anti-sway bar

*"Firm Ride" shocks

* Heavy gauge 14 X 5.5 in wheels

* Special Goodyear "Blue Streak" tires, 6.95 X 14

* Simulated "Mag" style wheel covers

* Tachometer, 6000RPM

* Speedometer, 150 mph

* Special Formula S badges

* Low restriction single exhaust with
no muffler (just a rear mounted resonator!)


* Cars with automatics got higher
shift points

Suprisingly, the Formula S package did not include the
well known "racing stripes", or the "wood grain" steering
wheel. Both were additional options.

I have a copy of Car Life June, 1965 and looked several times throughout the article for * Low restriction single exhaust with
no muffler (just a rear mounted resonator!) and can't find any wording close to this. The article does say "What must be the loudest muffler system on any production car produces a rumbling reminiscent of a runabout and a Rice Krispies overrun: Snap, Crackle and Pop.
The article does say the 235 horsepower 273 muffler type is "straight through" and the 180 horsepower 273 is "reverse flow". But nowhere does the article say "no muffler".

In the above picture, you can see the muffler attached to the exhaust pipe. And the muffler inlet and outlet pipes are in straight alignment with each other. Straight in with no baffling and straight out the end. Thus the very loud sound of the early HP engines.

Later in 65 and for subsequent 273 HP's, Chrysler modified the muffler to an offset inlet pipe with minimal baffling to significantly quieten the sound.