The Injen SES1207TT is a complete cat-back exhaust system engineered from the ground up for the 2015-2021 Subaru WRX and WRX STI. A performance-stepped pipe design uses 76mm primary tubing that transitions to 60mm dual feeds into a custom investment-cast Y-pipe, equalizing exhaust flow between both oval mufflers for a balanced tone across the entire rev range. Every component is mandrel-bent T304 stainless steel, TIG-welded by hand, and finished to show-quality standards at Injen's Pomona, California facility. V-band clamps at every joint eliminate the leak points common to conventional slip-fit connections and make the entire system removable without cutting. Dyno testing on the SES1207TT confirms gains of up to 13 horsepower and 11 lb-ft of torque over stock on both the WRX H4-2.0L Turbo and STI H4-2.5L Turbo. All factory mounting points and rubber hangers are retained for a direct bolt-on installation that requires no drilling, cutting, or vehicle modification.
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | Premium |
| 2015-2021 | Subaru | WRX | Limited |
| 2015-2021 | Subaru | WRX STI | Limited |
| 2015 | Subaru | WRX STI | Launch Edition |
| 2016 | Subaru | WRX STI | Series.HyperBlue |
| 2018 | Subaru | WRX STI | Type RA |
| 2020 | Subaru | WRX STI | S209 |
| Detail | Value |
|---|---|
| Part Number | SES1207TT |
| Primary Pipe Diameter | 76mm (3.0 in) |
| Secondary Pipe Diameter | 60mm (2.36 in) |
| Tip Size | 3.25 in Quad Burnt Titanium Look |
| Muffler Style | Dual Oval Straight-Through |
| Material | T304 Stainless Steel |
| Wall Thickness | 1.5mm |
| Weld Type | TIG Welded |
| Connection Type | V-Band Clamps with Cast Stainless Flanges |
| Mounting | All Factory Hanger Locations |
| Configuration | 4-Piece System |
| Warranty | Limited Lifetime |
| Country of Origin | USA (Pomona, CA) |
| UPC | 843115028930 |
Injen Technology was founded in Southern California and has spent decades developing performance intake and exhaust systems for import and domestic platforms. Every product is designed, tested, and manufactured in Pomona, California, where Injen engineers use in-house dyno facilities to validate real-world performance gains before a product reaches the market. This exhaust is the result of that same engineering discipline applied to one of the most popular performance platforms in the enthusiast community. Injen backs every exhaust with a Limited Lifetime Warranty against defects in materials and workmanship.
The Injen SES1207TT is a cat-back exhaust system for the 2015-2021 Subaru WRX and WRX STI. It is a complete four-piece T304 stainless system featuring stepped 76mm-to-60mm piping, dual oval mufflers, V-band clamps, and four 3.25-inch burnt titanium look tips, producing dyno-proven gains of up to 13hp and 11 lb-ft of torque.
Does this exhaust fit both the WRX and WRX STI?Yes. The SES1207TT is a direct fit for both the 2015-2021 Subaru WRX with the H4-2.0L Turbo engine and the 2015-2021 Subaru WRX STI with the H4-2.5L Turbo engine. All trim levels including Launch Edition, Series.HyperBlue, Type RA, and S209 are supported.
What does this Injen catback sound like?The dual oval straight-through muffler design produces a deep, controlled idle note that builds progressively to an aggressive, high-rev roar under full acceleration. The stepped pipe geometry and equal-length Y-pipe are specifically tuned to keep tone consistent across the rev range without resonance spikes at highway cruise speeds.
Does this system require any cutting or drilling?No. This catback bolts directly onto the factory connection point and uses all OEM rubber hangers and mounting locations. V-band clamps at every section joint replace standard slip-fit connections for a leak-free install that can be completed in under two hours with basic hand tools.
What is the pipe diameter on this Injen catback?The primary section uses 76mm (3.0-inch) mandrel-bent tubing that steps down to 60mm at the Y-pipe split feeding into each muffler. This stepped design maintains consistent flow velocity through the system rather than a uniform diameter throughout.
Can the exhaust tips be oriented differently?Yes. The four 3.25-inch burnt titanium look tips are bolt-on assemblies that can be installed in either a staggered or straight configuration depending on personal preference and rear bumper clearance.
What warranty does this Injen exhaust carry?This system is covered by Injen's Limited Lifetime Warranty against defects in materials and workmanship for the original purchaser. This covers the system under normal street use and does not cover damage resulting from improper installation, racing, or external impact.
How much power does this catback add?Injen's in-house dyno testing on the 2015-2021 WRX and WRX STI platform shows gains of up to 13 horsepower and 11 lb-ft of torque versus stock on an otherwise stock vehicle. Actual results vary by tune, altitude, and supporting modifications.
Is this exhaust legal for street use in California?This system is not an emissions-related part and can be used on emission-controlled vehicles. However, California has additional sound and emissions regulations for modified exhaust systems. Check local regulations before installation if your vehicle is registered in California or another state with enhanced emissions requirements.
Prop 65 Warning: WARNING: This product can expose you to chemicals including carbon monoxide and other combustion byproducts, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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