The Scorpion sport cat is designed to be less restrictive than a factory OE cat. The sport cat does exactly the same job as an OE cat by removing harmful gases but is less restrictive and therefore gives more power! By fitting a sport cat you can expect approx 10-15% more power and a small increase in noise levels. All Scorpion sport cats are road legal and will not affect your cars emissions and are therefore MOT-OK.