The Class KR Dual Center (B71354W) is a complete JQR-certified exhaust system engineered for the Subaru WRX STI and WRX S4.

Designed as a full “rear piece + dual center pipe set,” it delivers a powerful, regulation-compliant sound, improved flow, and a signature aggressive dual slash-cut aesthetic for both performance platforms.

Product Highlights

🔰 JQR-CERTIFIED DUAL-PLATFORM COMPATIBILITY
This comprehensive system is officially JQR-certified (JQR40153008), guaranteeing performance, quality, and legal compliance for both listed platforms. It meets Japan’s 2010 Acceleration Noise Regulation, providing a verified and legal full-system upgrade for road use.

🔊 POWERFUL, PLATFORM-TUNED EXHAUST NOTE
Engineered to deliver a deep, assertive sound profile tailored to each compatible model, measured within legal limits:

For WRX STI (EJ20):

• Nearby Exhaust Noise: 92 dB

• Idling Noise: 78 dB

For WRX S4 (FA20):

• Nearby Exhaust Noise: 90 dB

• Idling Noise: 68 dB

This ensures a commanding auditory presence that enhances the driving experience for each unique engine.

🔧 COMPLETE DUAL CENTER PIPE SET
A full 3-piece system providing a comprehensive upgrade from the factory exhaust. This “rear piece + dual center pipe set” ensures optimized exhaust flow, performance gains, and a complete transformation of the vehicle’s rear profile with its distinctive dual slash-cut exits.

🏗️ DURABLE STAINLESS STEEL CONSTRUCTION
Manufactured from high-quality stainless steel for longevity and performance. The system is engineered for an optimal balance of strength and weight:

• System Weight: 21.1 kg (OEM reference: 22.6 kg)

• Features distinctive dual slash-cut 96mm tailpipes for an aggressive, motorsport-inspired appearance.

Technical Specifications & Application

This is a JQR-certified, street-legal full stainless steel dual exhaust system for the Subaru WRX STI and WRX S4.

Key Details

• Product Name: Class KR Dual Center [’10 Acceleration Noise Regulation Compliant Model]

• Product Code: B71354W

• JAN Code: 4512355209497

• Stock Status: In stock

Vehicle Compatibility
WRX STI (6MT)

• Chassis: CBA-VAB (Acceleration noise regulation applicable vehicle)

• Engine: 2.0L Turbo (EJ20)

• Drivetrain: 4WD (AWD)

• Grade: STI (including Type S)

• Transmission: 6MT

• Model Years: August 2014 – April 2020

• Note: Fitment for S207, S208, and TYPE RA-R models is not confirmed and is not JQR-certified.

WRX S4 (CVT)

• Chassis: DBA, 3BA-VAG (Acceleration noise regulation applicable vehicle)

• Engine: 2.0L Turbo (FA20)

• Drivetrain: 4WD (AWD)

• Grade: 2.0GT(-S) EyeSight, STI Sport EyeSight (including tS & STI Sport models)

• Transmission: CVT

• Model Years: August 2014 – March 2021

Construction & Dimensions

• Material: All Stainless Steel

• Pipe Diameter: 60-50W

• Tailpipe Diameter: 96 mm (Slash-cut style)

• Exit Direction: Dual, Left & Right

• Number of Sections: 3

• Unit Weight: 21.1 kg

• Packaging Size: 2200 × 350 × 784 mm

• Packaging Weight: 30.9 kg