The GReddy EVO 2 Cat Back Exhaust System is all new for 2004 with a Full Stainless Steel Design. The GReddy EVO2 is designed to place the Rear Muffler higher in the chassis, allowing for more ground clearance with maximum exhaust flow and sound tuning. The nicest aspect of the EVO2 is the Low Exhaust Note that it creates. Most of the GReddy EVO2 Systems use straight through canisters, which will work for Naturally Aspirated engines or Light Pressure Turbocharged engines. You can expect Horsepower Gains in the range of 7-20 Horsepower depending on engine size. GReddy has designed the EVO2 Cat Back Exhaust to bolt up to the Factory Catalytic Converter and remain 50 State Legal.