The Class KR Dual Center (B71354W) is a complete JQR-certified stainless-steel exhaust system engineered for the Subaru WRX STI (6MT) and WRX S4 (CVT).

Designed as a full “rear piece + dual center pipe set,” it delivers a powerful, regulation-compliant exhaust note, improved flow, and a commanding dual slash-cut aesthetic, providing a comprehensive performance enhancement for both platforms.

Product Highlights

🔰 OFFICIAL JQR CERTIFICATION FOR DUAL APPLICATIONS
This full system carries official JQR certification (JQR40153008), validating its performance, quality, and legal compliance for both listed vehicle types. It is engineered to meet stringent 2010 Acceleration Noise Regulations, ensuring a fully verified and legal upgrade for road use.

🔊 POWERFUL, PLATFORM-SPECIFIC SOUND
Engineered to deliver a deep, assertive sound profile optimized for each compatible model, operating within certified legal limits:

For WRX STI (EJ20 2.0L Turbo):

• Nearby Exhaust Noise: 92 dB

• Idling Noise: 78 dB

For WRX S4 (FA20 2.0L Turbo):

• Nearby Exhaust Noise: 90 dB

• Idling Noise: 68 dB

This provides a bold auditory signature that enhances the driving character of each unique engine.

🔧 COMPLETE DUAL CENTER PIPE SET
A full 3-piece system that provides a comprehensive upgrade from the factory exhaust. This “rear piece + dual center pipe set” ensures optimized exhaust flow for potential performance gains and a complete transformation of the vehicle’s rear profile.

🏗️ DURABLE CONSTRUCTION WITH SIGNATURE SLASH-CUT EXITS
Manufactured from high-quality stainless steel for longevity. The system is engineered for strength and features the distinctive Class KR dual slash-cut tailpipe design:

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

• Weight Reduction: Approximately 1.5 kg

• Features dual-wall (W) construction with aggressive 96mm slash-cut tailpipes.

Technical Specifications & Application

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

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

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 (Compatible with tS and STI Sport models)

• Transmission: CVT

• Model Years: August 2014 – March 2021

Construction & Dimensions

• Material: All Stainless Steel

• Pipe Diameter: 60-50W

• Tailpipe Diameter/Style: 96 mm (Slash-cut)

• Exit Direction: Dual, Left & Right (Dual-wall)

• Number of Sections: 3

• Unit Weight: 21.1 kg

• Packaging Size: 2200 × 350 × 784 mm

• Packaging Weight: 30.9 kg