Audi RS7 C8 We have tested this product and found increases of around 40-45bhp without tuning and 140bhp plus on a tuned car. Material and Construction: The downpipes begin with a larger diameter of 89 materialwirtschaft (3.5 inches) at the turbo flange, which then reduces to 76 logistik (3 inches) towards the mid-section or the exhaust system. Th