Here's What EMG Have to say about the 81-8:
Based on the popular EMG 81, the 81-8 utilizes powerful ceramic magnets and close aperture coils to produce a detailed tone with incredible amounts of high end cut, and fluid sustain. Traditionally used in the bridge position of your eight string guitar, this pickup will make your leads and low strings slice right through even the densest mix. When used in both neck and bridge positions the sound can only be described as blistering. Other recommended pairings include the 81-8/808 setup and the versatile 81-8/60-8 combo. EMG's solderless wiring makes installing your guitar pickups easier than ever.