The COBB 15-20 Subaru STI SS 3in Cat-Back Exhaust Hardware Kit does not have enough exact application evidence to assign safe vehicle YMM. Match manufacturer part number 515132-HW, complete vehicle, engine and transmission configuration, factory equipment, required calibration, emissions eligibility, interfaces, and every product note before ordering.

Key Features

• Stainless Steel V-Band Clamps: Provides airtight seals at turbo outlet and mid-pipe connections, preventing exhaust leaks and maintaining backpressure efficiency.
• Precision Bolts and Nuts (Grade 8): Matches OEM thread specs with corrosion-resistant 304 stainless construction for repeated torquing without stripping.
• Rubber-Coated Hangers (x4): Absorbs road vibrations, reduces noise, and secures exhaust sections in stock positions for direct bolt-on fit.
• Complete Fastener Set: Includes all M8/M10 bolts, lock washers, and flange nuts requiredno additional parts needed for full assembly.
• USA-Made Quality: Engineered by COBB for exact tolerances on STI cat-back (PN 515132), supporting 400+ whp builds.
• 304 stainless hardware withstands heat cycles and road salt.

Fitment

Specifications

What’s Included

One new COBB product in the exact configuration and quantity identified by manufacturer part number 515132-HW. Calibrations, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, tools, and companion components are included only when expressly stated for this exact part number.

About COBB

COBB develops engine-management, intake, cooling, exhaust, drivetrain, suspension, and vehicle-accessory products for supported performance platforms. Correct selection remains exact-vehicle, exact-configuration, exact-interface, and exact-part-number specific.

Related COBB Products

• COBB 15-21 Subaru WRX Big SF Intake System Airbox Bracket Kit (for 745110)
• Cobb 15-21 Subaru WRX MAF Extension Harness
• Cobb Subaru Big SF Intake System Hardware Kit (for 745110)

Browse the COBB collection for related tuning, intake, cooling, exhaust, drivetrain, and chassis products.

Frequently Asked Questions

Why is fitment verification required for this COBB product?
Exact vehicle application evidence is not complete enough for safe YMM. Confirm the vehicle, drivetrain, factory equipment, calibration, emissions eligibility, interfaces, and exact part number before ordering.

Are all supporting parts included?
Only components expressly listed for the exact manufacturer part number are included. Tuning, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, and companion components may be separate.

Is tuning or calibration required after installation?
Requirements depend on the exact product and vehicle. Intake, fuel, boost, turbo, and engine-management changes may require a compatible calibration before operation.

Installation Instructions

Follow the current COBB and factory service instructions for this exact part number. Verify fitment, factory equipment, emissions eligibility, required calibration, software and firmware, interfaces, hardware, fluid or electrical connections, and clearances before installation. Inspect the completed work and confirm safe operation before full-load use.