The aFe 48-36803 unequal-length header uses 1-5/8-inch to 2-1/2-inch mandrel-bent 304 stainless tubing, formed collector transitions, 100% TIG welding and laser-cut steel flanges. Fitment requires the exact listed engine and years; the later 2015–2019 WRX 2.0L is outside the manufacturer’s selected scope. Resolve the guide’s missing final heatshield and battery reconnection instructions before installation.
Only the listed turbo engine/year configurations are supported: Impreza WRX 2.0L 2002–2005 and applicable Impreza/WRX/STI/Legacy 2.5L turbo rows thereafter. The current table lists WRX through 2014, STI through 2021 and Legacy through 2013; named trim evidence restricts each row below. The retailer’s 2015–2019 WRX Base/Limited/Premium entries are overridden by this scope and Subaru’s official specifications for all five years identifying the non-STI WRX as 2.0L FA20. Earlier WRX support does not approve those later 2.0L vehicles. Preserve the STI Limited 2008–2010 gap.
| Years | Make | Model | Submodel | Required engine / exclusions |
|---|---|---|---|---|
| 2009-2010 | Subaru | Impreza | 2.5 GT | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2002-2014 | Subaru | Impreza | WRX | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2006-2007 | Subaru | Impreza | WRX Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2010-2014 | Subaru | Impreza | WRX Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2009-2014 | Subaru | Impreza | WRX Premium | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2004-2014 | Subaru | Impreza | WRX STI | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2007 | Subaru | Impreza | WRX STI Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2011-2014 | Subaru | Impreza | WRX STI Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2010 | Subaru | Impreza | WRX STI Special Edition | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2006-2007 | Subaru | Impreza | WRX TR | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2010-2012 | Subaru | Legacy | 2.5GT | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2005-2006 | Subaru | Legacy | GT | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2005 | Subaru | Legacy | GT Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2007-2009 | Subaru | Legacy | GT Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2006-2009 | Subaru | Legacy | GT spec.B | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2015-2021 | Subaru | WRX STI | Base | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2015 | Subaru | WRX STI | Launch Edition | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2015-2021 | Subaru | WRX STI | Limited | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2019 | Subaru | WRX STI | S209 | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2016 | Subaru | WRX STI | Series.HyperBlue | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| 2018 | Subaru | WRX STI | Type RA | Turbo 2.0L only in Impreza WRX 2002–2005; applicable turbo 2.5L thereafter. No 2015–2019 WRX 2.0L approval. |
| Detail | Value |
|---|---|
| Manufacturer Part Number | 48-36803 |
| Product type | Headers & Manifolds |
| Construction | Unequal length; 1-5/8-inch to 2-1/2-inch mandrel-bent 304 stainless tubing, formed collector transitions, TIG welding and steel head flanges. No printed flange thickness or tube gauge. |
| Formal bill | One header 05-145788, one flat washer 03-50228 and one M8 x 1.25 locknut 03-50244. No new head gaskets, heatshield, battery hardware, intake filter or coupler is established as supplied. |
| Selected guide | One page, all 15 steps, bill and photograph; document 06-86580, February 2021. Its older STI range ends in 2020; the current manufacturer table extends STI to 2021. |
| Engine conflict resolved | Official Subaru 2015–2018 WRX specification documents and the 2019 owner manual specification page identify non-STI WRX as 2.0L/1,998 cc FA20. This does not match the selected manufacturer’s later 2.5L turbo scope; retailer-positive 2015–2019 WRX Limited/Premium scopes are removed and Base is not added. |
| Original parts / unresolved completion | The guide restores the O2 sensor, ground wire with supplied hardware, and splash guards. It removes the stock heatshield but gives no final shield disposition. It recommends disconnecting both battery terminals but prints no reconnection step. Obtain exact completion instructions before work. |
| Torque / recheck | The generic printed band-clamp instruction is 40–45 ft-lb, but no band is in the bill and no selected band attachment point is identified. Do not apply it to head fasteners or ground hardware. Recheck all clamps and hardware after 50–100 miles. |
| Performance / emissions | No selected dyno or numerical flow chart establishes measured gains. Manufacturer states not CARB exempt; no California purchase or use on a California DMV-registered vehicle. |
| UPC | 802959483107 |
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
It is the unequal-length 304 stainless turbo header for the specific listed Subaru engine/year configurations, supplied with one washer and one locknut.
Does this fit a 2015–2019 WRX 2.0L?The selected manufacturer scope does not approve that later 2.0L FA20 WRX. Official Subaru documents identify that engine in all five years, so retailer-positive Base/Limited/Premium entries do not establish compatibility.
Which 2.0L application is supported?The manufacturer expressly includes Impreza WRX 2002–2005 turbo 2.0L. The later listed applications require the applicable turbo 2.5L configuration and each exact row’s years.
Is it an equal-length or mitered-collector design?It is the selected unequal-length design with formed collector transitions and TIG-welded 304 stainless tubing. The selected page describes steel flanges without a separate flange alloy or thickness.
Are new gaskets and sensors included?The formal bill lists one header, one washer and one locknut. Reuse original head gaskets only if undamaged and restore the original O2 sensor and other specified original parts.
What needs confirmation before installation?The guide removes the stock heatshield without final disposition and recommends disconnecting both battery terminals without a printed reconnection step. Obtain exact aFe/current vehicle completion instructions before work; do not assume either omission authorizes leaving the vehicle incomplete.
Can 40–45 ft-lb be used for the head nuts?No. That printed figure is for band clamps, with no selected band point identified here. Obtain exact head and ground fastener service specifications. The guide separately calls for a 50–100-mile hardware recheck.
Are gains or California exemption verified?No selected dyno or numerical flow chart is supplied. Manufacturer states this product is not CARB exempt and prohibits California purchase or use on a California DMV-registered vehicle.
California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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