AFE has great performance bolt on products for the 2015-2017 Subaru WRX STi 2.5L (t) via Marken Performance.
Part # TA-4306B-R is a Takeda Stage 2 Intake that outflows the factory intake by 56%. It uses a high quality polyethylene Red intake scoop to capture the coolest air as well as a ABS plastic heat shield to block unwanted engine heat and eliminating heat soak to the 7" tall conical 360 degree radial flow performance air filter. Part # TA-4306B-R uses a Pro 5R oiled 5-Layer air filter, intake part # TA-4306B-D uses an dry oil-free 3-Layer Progressively Finer Porosity Synthetic Media air filter.
Part # 48-36802 is a Long Tube Header with a 4-to-1 formed collector that has optimized tube lengths which eliminate dead space that can cause turbulence and hinder flow.
Part # 48-36801-HC is a Down-Pipe that has a 2.5" to 3" stepped design for increased exhaust velocity and eliminates low pressure drops which helps to scavenge the exhaust for increased power. It also has a high flow 400 CPSI catalytic converter.
Part # 49-36801-P is a Stainless Cat-Back with single 3" mandrel-bent pipe into dual 2.25" mandrel-bent pipes with two 304 stainless steel polished 3.5” diameter tips on each side.