VRSF Racing Headers Porsche 991 GT3 GT3 RS 911R 14-19VRSF Porsche 991 GT3 991. 2 GT3 Race Headers Developed in house for the track and hand crafted from mandrel bent SS304 grade stainless steel, the VRSF Race Header offers increased horsepower and torque throughout the power band due by increasing the overall flow of the exhaust from the engine to the rest of your exhaust system. This upgraded system increases throttle response and dramatically enhances the sports car sound from your flat 6. Our CFD