Unlike any other exhaust system, the patented Vortex™ technology vacuums exhaust gases out at high speed. This lowers back pressure, allowing your engine to run much more efficiently. If your car has a turbo, a Vortex™ raceflo exhaust will eliminate turbo lag. The results will amaze you! Annual fuel saving of over 500 litres (15,000 miles) Full details in documents tab for each system.