Cat-Back System

This 3" diameter into dual 2.25" BORLA Cat-Backâ„¢ system is tuned for performance and sound for both the 2.0L engine in the WRX and the 2.5L engine in the STI. Our S-Type sound level is designed to bring out the Subaru Boxer engine rumble and provides an aggressive sound without the drone. This system features quad (2 per muffler) 3.5" round high temperature black coated T-304 stainless steel tips, but is also available with polished T-304 stainless steel tips. For ease of installation, this Cat-Back is a direct bolt on part and does not require cutting. BORLA Cat-Backâ„¢ & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA Sound of Power respected by motoring enthusiasts everywhere. Like all BORLA exhaust products, each system is handmade in the USA by master craftspeople and features premium, high-quality T-304 austenitic stainless steel construction, precision computer numerical control (CNC) manufacturing, ultra-smooth mandrel bent piping, and a Million-Mile Warranty.

Additional Information

S-Type Cat-Back Exhaust System 2015-2021 Subaru Impreza WRX/ WRX STI Sedan 2.0L/ 2.5L Turbo 4 Cyl. All Wheel Drive Automatic/ Manual Transmission 4 Door.

Application Summary

2015-2021 Subaru Impreza WRX/ WRX STI Sedan 2.0L/ 2.5L Turbo 4 Cyl. All Wheel Drive Automatic/ Manual Transmission 4 Door.

Part Type

Exhaust System Kit

Product Overview

This BORLA(r) Cat-Back(tm) system is tuned for performance and sound for both the 2.0L engine in the WRX and the 2.5L engine in the STI. Our S-Type sound level is designed to bring out the Subaru Boxer engine rumble and provides an aggressive sound without the drone. This system features 3.5" quad high temperature black coated T-304 stainless steel tips, but is also available with polished T-304 stainless steel tips. For ease of installation, this Cat-Back(tm) is a direct bolt on part and does not require cutting. Like all BORLA(r) exhaust products, each system is handmade in the USA by master craftspeople and features premium, high-quality T-304 austenitic stainless steel construction, ultra-smooth mandrel bent piping, and a Million-Mile Warranty.

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Product Details

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Exhaust System, S-Type, Cat-Back, Stainless Steel, Natural, Split Rear Exit, Black Ceramic Tips, Subaru, Kit

Borla S-type cat-back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower and produce a more aggressive sound and higher flow. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive Borla Sound of Power respected by motoring enthusiasts everywhere.

Each system is built from premium 300-Series austenitic stainless steel, superior to T-400 Series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow and power, and precision computer-controlled CNC manufacturing ensures an accurate fit. It's just what you'd expect from the world's most experienced (and most winning) exhaust brand.