aFe power introduces an all new Twisted Steel "Street" Down-Pipe for the Subaru WRX STI 2015-2019 with H4-2.5L engine. This down-pipe is designed using a 400 CPSI catalytic converter and mandrel-bent, 304 stainless steel tubing for optimum flow resulting in added horsepower and torque. The down-pipe is 100% hand TIG-welded and uses a unique fabricated bellmouth design that increases exhaust velocity and eliminates low pressure drops which helps to scavenge the exhaust for increased power. In house testing produced a max gain of +22 horsepower and +37 ft. lbs. of torque verified by our in house dyno. This kit includes a second bung for either a wide-band O2 gauge or auxiliary instrumentation.
This system utilizes a 400 CPSI (cell per square inch) catalytic converter for maximum flow.
Fabricated Bellmouth Design:
A unique fabricated bellmouth design increases exhaust velocity providing a free flowing wastegate.
100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks.
Brushed 304 SS Construction:
This down-pipe is constructed of durable mandrel bent brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.
All hardware and brackets are included for a hassle-free installation. This unit also comes with a 2-year warranty.
Auxiliary O2 Bung:
This down-pipe uses factory mounting locations for the O2 sensor and includes an additional bung for either a wide-band O2 gauge or auxiliary instrumentation.
aFe POWER down-pipe are engineered and manufactured in our Corona, California manufacturing facility.
WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.