We have modified the internal baffling of this muffler to provide a flow-through equivalent
to a 2 ¼" round pipe. The inlet pipe being 2" inside-diameter, this means there is very little restriction
in the muffler. Ford originally designed this muffler with a 1 ¾" inside-diameter rear tail pipe. We are
finding that because the exhaust gases cool as they flow through the muffler, the smaller tail pipe works just fine,
as the exhaust gases have cooled sufficiently to take up much less space. All gases (oxygen, nitrogen and carbon
monoxide) expand or contract dramatically with only small changes in temperature.
It is interesting to note that the Model "B" muffler that was produced in
1932 is similar to the Model "A" muffler in design, but Ford only used a 1 ½" inside-diameter tail
pipe for an engine that was 10 horsepower stronger. Dyno tests seem to confirm that the smaller tail pipe (1 ¾")
works just fine with the high performance muffler. We have found the sound is slightly louder, but still has the Model
This muffler is designed for use with high performance flat heads putting out over 80
horsepower and overhead valve conversions. The standard Aries muffler will work just fine on all flatheads 80 horsepower
Dyno test with High Performance Muffler
Testing was done by
Bill Stipe of Specialty Motor Cams (see photos). Bill says:
"On my engine it made 86 HP and 150 foot-lbs torque
at 3000 RPM, and 72 HP and 172 torque at 2200 RPM. This
is a very strong running engine in the car. See my Performance
Chart." For information on Bill’s cams or
his high performance flat head engines call: 920-467-2895.
Five year warranty on all products
Shipped in a heavy-duty box by UPS or FedEx.
Performance Standard Muffler
$255 plus shipping.
Standard steel in black finish.
Performance Stainless Steel Muffler
$350 plus shipping.
Check, money order, Visa and