I have wondered this also. I cannot see there THAT much difference, just neater and perhaps less likely to pop off. From reading posts in the past it isn't those pipes that are prone to popping off.
I am keen to buy the allard kit but have seen some pic of it looking like a more convoluted route than the standard. With the larger diameter the car works much better though
I am after one with just silicone pipes and a few metal connectors, not the other way round which is what the allard kit. I may look at putting my own together, something for a rainy day.
