A Scorpion Cat Back Exhaust System is a good compromise between performance gains and ease of fitting, swapping out the original components from the catalytic converter back. The systems generally replace secondary catalytic converters where fitted. Some systems may go from the secondary catalyst back where necessary and these are described as Secondary Cat-Back Exhaust System.This in combination with Scorpions exhaust design know-how helps increase power through increased flow-rate and reduced back pressure but leaves primary catalytic converters in place so the car remains road legal and will pass MOTs. Made using precision mandrel worked aircraft grade T304 steel. This is the highest standard steel used for automotive parts and offers excellent corrosion resistance and thermal properties. Scorpion offer a lifetime guarantee for the original purchaser on all their exhaust systems.Scorpion supply their back-boxes with one of their range of tailpipes to suit the vehicle:STW Tailpipes: