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aFe Twisted Steel Down-Pipe (Street Series) - Subaru STI VA


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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.

Catalytic Converter:
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.

Hassle-Free Installation:
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.