They produce lower temperatures and less exhaust backpressure due to the relief of the turbocharger. The cylinder charge is increased which gives you maximum performance. These will fit the following models.
We have tested this product and found increases of around 40-45bhp without tuning and 140bhp+ on a tuned car. Professional installation is recommended as some exhausts sit slightly different from others and can be tight. If you have a later model car with OPF/PPF filters they will need coding out so you will need to find a tuning company who can do this. These will not fit direct to the car, you will need a stage 2 flash. These should pass an MOT emissions test when fitted.
They are road legal and Euro 5 rated.