Equal length shorties move more air than unequal length shorties.
Unequal shorties would be much better for a stock engine cause equal lengths take away all of your back pressure and you sacrifice torque.
equal length shorties are harder to install.
I love my BBK eqaul length shorties they look great and made my car have a nice deep rumble..
GOOD LUCK
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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit 3.73 FMS gears cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires. Edelbrock 1 1/2 inch drop springs.