This item is included in the MILLTEK SPORT Focus RS cat back system. It is not required seperatly.
Other Manufacturer's systems may not come with this Flexy  pipe , we know the Scorpion and the Primary designs to name two.

 If your car has not got one of these fitted you will be missing a huge amount of power, they typically restrict cars with more than 280 bhp.

BIG HORSE POWER AN ABSOLUTE MUST  !