Click to zoom in
SKU: B515140 | UPC: 700424677429
Cobb 2015-2021 Subaru WRX/STI Titanium 3in Catback Exhaust
The Cobb Titanium 3" Catback Exhaust replaces the factory system from the catalytic converter back on 2015-2021 Subaru WRX and 2015-2019 WRX STI models. This direct-fit system uses lightweight titanium tubing to cut over 14 lbs off the vehicle's rear weight while boosting exhaust flow for 10-12 wheel horsepower gains and quicker throttle response. Enjoy a deep, aggressive exhaust tone tuned to minimize cabin drone on highways.
Key Features
- Titanium Construction: Full titanium mid-pipe and muffler weigh just 17 lbs total, shedding 14.7 lbs from stock WRX (31.7 lbs) or 14.5 lbs from STI for better acceleration and handling.
- 3-Inch Mandrel-Bent Tubing: Smooth bends and larger diameter increase exhaust velocity, adding 10-12 whp and 12-15 ft-lbs torque across the RPM range.
- Aggressive Sound Tuning: Deep rumble at idle builds to a throaty roar under load, with Helmholtz muffler design reducing interior drone for daily driving comfort.
- Burnt Titanium Tips: Dual 4.5-inch slash-cut outlets provide heat-colored finish and bold rear stance without polishing.
- Bolt-On Design: Uses factory hangers and 3" V-band connections for simple replacement, no fabrication needed.
Product Notes
- MPN 515140 made in the USA with precision TIG-welded titanium.
- Inspect tips periodically for heat discoloration, normal for titanium.
Installation Notes
- Professional installation recommended.
- Requires stock catalytic converter 3" inlet mates directly to cat flange.
- Reuses OEM rubber hangers and clamps torque V-band clamps to 8-10 ft-lbs.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | Base, Premium, Limited |
| 2015-2019 | Subaru | WRX STI | Base, Limited |
Why Choose Cobb?
- Subaru performance leader with 20+ years developing WRX/STI parts.
- Track-tested designs from dyno and road data for real-world gains.
- Precision-engineered in-house for exact VA-chassis fitment.
Frequently Asked Questions
-
Q: Does this fit 2020-2021 WRX models?
A: Yes, direct bolt-on for all 2015-2021 WRX trims including Base, Premium, and Limited with no modifications. -
Q: What material is used and is it durable?
A: Grade 2 titanium tubing and muffler with stainless flanges; corrosion-resistant and rated for 1200°F+ exhaust temps. -
Q: What is the warranty and install time?
A: 1-year limited warranty DIY install takes 1-2 hours with basic tools, ramps recommended.
Shipping & Handling
- Method: UPS or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Oversized box measuring 58" x 14" x 14"
- Weight: 22 lbs
Catback
Shop catback exhaust systems at Black Ops Auto Works for cat-back exhaust kits, performance exhaust systems, stainless steel exhausts, titanium exhausts, dual rear exit exhausts, track exhausts, touring exhausts, axle-back exhausts, and street performance exhaust upgrades. This collection is built for drivers who want deeper sound, improved exhaust flow, better throttle response, aggressive rear-end styling, and vehicle-specific bolt-on fitment. Use this Catback collection to choose the right exhaust system by vehicle platform, brand, material, sound level, tip finish, and driving goal. A catback exhaust can help improve sound, reduce exhaust restriction, support performance upgrades, and give your car, truck, SUV, Jeep, or performance build a cleaner, more aggressive look. Shop Catback Exhaust Systems by Brand Black Ops Auto Works carries catback exhaust systems from trusted performance brands including Borla, CORSA Performance, MagnaFlow, MBRP, AWE Tuning, Invidia, Solo Performanc...
View Catback Products
COBB
COBB Tuning Performance Parts deliver proven power gains with factory-like drivability backed by an "Engineered Performance" approach trusted by enthusiasts, pro tuners, and performance shops worldwide. Founded in 1999 and now headquartered in Austin, Texas, COBB designs, engineers, tests, and supports its products in-house to ensure reliable results across today's most popular performance platforms. Shop the full lineup of COBB Tuning performance parts at Black Ops Auto Works, including ECU tuning solutions, bolt-on upgrades, and staged power packages built to work together for predictable, repeatable performance. COBB ECU Tuning & Accessport The COBB Accessport is one of the most trusted ECU tuning devices in the industry. It enables safe ECU flashing, live data monitoring, diagnostics (read/clear codes), and tuning management helping drivers unlock stronger throttle response, improved drivability, and dependable horsepower and torque gains when paired with the right supportin...
View COBB Products
Exhaust Systems
Black Ops Auto Works carries one of the largest selections of performance exhaust systems available online, with 7,700+ products covering cat-back exhausts, axle-back exhausts, turbo-back systems, downpipes, headers, mid-pipes, X-pipes, H-pipes, mufflers, resonators, catalytic converters, exhaust tips, and every component in between. Whether you're building a street car, a daily driver, a diesel truck, or a track build, the right exhaust upgrade is here. Shop by Exhaust System Type Cat-Back Exhaust Systems: The most popular performance exhaust upgrade. Replaces everything from the catalytic converter back for improved sound, better flow, and premium tip styling. Available in single exit, dual exit, and quad exit configurations. Axle-Back Exhaust Systems: A simpler bolt-on that replaces the rear section from the axle back. Best for drivers who want an improved exhaust note and cleaner tip appearance without a full system swap. Headers and Manifolds: Long tube headers and shorty h...
View Exhaust Systems Products