This is the finest exhaust available for the Porsche 991 Carrera 3.4L. Period.The Porsche 991 Carrera Performance Exhaust by AWE is for those looking to increase power and bring out the note of their 3.4L power plant, without turning their backs on perfect daily-drivability and Porsche sophistication. Constructed from T-304L Stainless Steel, the AWE Carrera Performance Exhaust for Porsche 991 shows maximum gains of 29hp and 33tq at the crank and weighs in at 12lbs less than the stock unit. Light it up.This system was developed first on a PDK car, then a manual. The exhaust was created to be 100% PDK friendly and retains the signature AWE tone through the power band. In other words, this system will remain 100% drone-free – PDK or Manual. This version of the system is for use with stock tips - and you can always upgrade to tips later. Better still, none of the components of our AWE Porsche 991 Carrera Performance Exhaust affect or alter any of the emissions devices on the vehicle, and therefore this exhaust is fully legal for street use.This is the exhaust You've been waiting for.Important note: This product is only confirmed to fit non-PSE vehicles at this time.