Ford 302 exhaust problem

[Topher]

Hi, a couple months ago I installed a dual Magnaflow exhaust system with no catalytic converters onto my 84 302 ford e150 van. I'm getting very little sound out of the left pipe, the right is nice and loud. But just by putting my hand next to the pipes I can feel the preasure difference. does anyone know what's up ,possibly? Thx

[carriedi]

are the mufflers directional?