HKS Exhaust Subaru WRX (02-07) WRX STi (04-07) Legal Muffler Catback - 31013-BF001

The HKS Legal Muffler Catback Exhaust delivers an aggressive, sporty exhaust note that turns heads without turning your daily drive into a drone fest. Designed for enthusiasts who want power, sound, and style, this system will improve performance while maintaining street-friendly volume.

Fitment Information

• Subaru WRX Sedan & Wagon (2002, 2003, 2004, 2005, 2006, 2007) 
• Subaru WRX STi Sedan (2004, 2005, 2006, 2007) 

Emissions Compliance

• HKS exhaust systems maintain all emissions equipment intact without any alterations, replacements, or modifications.

Specs & Features

• 75mm Piping Diameter – Optimized for maximum exhaust flow and efficiency

• Durable Mild Steel Construction – Built to last through intense driving and weather conditions

• Polished Stainless Steel Muffler & 106mm Exhaust Tip – Adds a sleek, aggressive look

• Tapered Piping – Ensures smoother exhaust flow for better turbo spool and throttle response

• Increased Horsepower and Torque – Offers a direct, unobstructed path for exhaust gases, unlocking power gains

• Reduces Turbo Lag – Improved exhaust flow minimizes lag, delivering quicker turbo response

• Aggressive Exhaust Note – A bold sound that enhances the driving experience without excessive noise

• Direct Fitment – Exhaust hangers welded in OEM locations for an easy, bolt-on installation

• New Hardware & Gaskets Included – Everything you need for a smooth, hassle-free setup

Product Description

The HKS Legal Muffler Catback Exhaust is engineered to maximize your vehicle’s performance by improving exhaust flow and minimizing backpressure. With 75mm piping, the system provides an unobstructed exit for exhaust gases, increasing horsepower and torque for a quicker, more responsive ride. Say goodbye to turbo lag, and hello to smoother acceleration and faster turbo spool.

Crafted from mild steel, this exhaust system is designed for durability, with a polished stainless steel muffler and a sleek 106mm exhaust tip that gives your car a striking, aggressive look. The tapered piping ensures that exhaust gases flow smoothly, further improving turbo performance and reducing restrictions.

Not only does the system increase performance, but it also delivers an aggressive exhaust note that adds excitement to every drive—without crossing into annoying drone territory. The best part? The direct fitment design means you can easily install it using the OEM hangers, with all necessary hardware and gaskets included for a smooth, hassle-free upgrade.