2-1/4" Exhaust with cross-over
Aurora #110 had a restricted "chuffy" exhaust
sound, and mufflers further reduced the flow diameter of the factory
installed 2" pipes to 1-5/8". Power peaked around 3,600 RPM.
The biggest improvement in power with the smallest cash investment was
upgrading to 2-1/4" throughout.
The modern catalytic converters, fed by the stock Ford
air pump, offer no restriction, and efficiently eliminate the smell
of unburned exhaust gases in the driver's clothing. The cross-over contributes
to even exhaust flow by eliminating pulse back-pressure. It does make
it a challenge to change the clutch, however.
The straight through skinny glass packs shown here were
later replaced with Flowmaster dual baffle mufflers for a throaty but
less raspy exhaust note.