A.
anwered by: a guest
To add to the answer from Canteau, the L03A has a longer lasting resin than the L02A, otherwise it is similar in modularity and in noise levels (aka silent expect for when it rains). The L04A has a metallic compound, which doesn't seem to last any longer, doesn't quite modulate as well and screams in the dry. In rainy conditions it will make cars slam on their brakes in a panic when they hear you braking. (some may consider this an additional safety feature)