I know what a peloquin is but whats an 80% kit??
The design of the 020's differential already provides a very small amount of "limited slip" due to friction in the cross pinions (I believe there's a spring kind of between them) - from the factory I've heard them referred to as a '20%' limited slip in that it will still try and keep 20% of the torque in to the wheel that is not slipping. As the tranny wears though that number becomes smaller.
An 80% kit is a tighter spring with associated hardware that is installed between the cross pinions that provides more friction. It will try and keep the torque within 80% to both wheels. It's not a true limited slip, but it's a well tried and tested modification for VW's transmission design. Kind of an economy way to improve the existing differential.