The peculiarity is due to the fact that the collector has been made in two separate parts, a first part of the manifold 4-2-1 and the other part is formed by a curved tube to reach the original position, where desired, for those who wish you can enter a coupon and saldado the catalyst tube.
The manifold is a genuine part, there is nothing to weld to install it.
There are already welded to attack both oxygen sensors.
Can be installed on all models of Mini Cooper (Mini One, Mini Cooper, Cooper S) is complete with hose to remove the catalytic converter with associated hardware and its joint that prevents the hose.
To avoid the warning light engine in the options you can choose to buy even with the minikat.