Grimmspeed Gentleman’s Resonated Catback V2 2015-2021 WRX / 2015-2021 STI | Refined Tone | Performance Exhaust System

Overview

The Grimmspeed Gentleman’s Resonated Catback V2 is a meticulously engineered exhaust system designed specifically for the 2015-2021 Subaru WRX and STI models. This version builds on the original gentleman’s exhaust concept, delivering a balanced and refined exhaust note that avoids drone while maintaining a strong, confident presence. It is ideal for enthusiasts who want a sophisticated sound profile without sacrificing performance or daily drivability.

Grimmspeed’s approach to this catback focuses on precision fitment, durability, and acoustic refinement. Key design updates include dual-overlapping slip fit connections and a dual-hanger mid-pipe that allow for greater adjustability and chassis-specific alignment. The upgraded muffler design features larger perforated cores and an improved Y-splitter to enhance flow, paired with long-lasting packing material that resists degradation over time. These engineering choices reflect Grimmspeed’s commitment to quality and performance for Subaru owners.

For Subaru enthusiasts planning additional exhaust modifications, the resonated mid-pipe version offers a smoother, more controlled sound as airflow increases throughout the system. This makes it a practical choice for those running supporting mods who want to maintain a clean exhaust tone without harshness or excessive drone. The use of premium 304 stainless steel and TIG welding ensures longevity and corrosion resistance, making this catback a reliable upgrade for both street and spirited driving.

Features & Specifications

This Grimmspeed Gentleman’s Resonated Catback V2 is engineered for the 2015-2021 Subaru WRX and STI (VA Chassis) and features 304 stainless steel construction with dual-overlapping slip fit connections. Constructed from high-grade stainless steel, it delivers improved flow and a refined exhaust tone for Subaru enthusiasts seeking a durable and well-tuned performance exhaust.

• Brand: Grimmspeed
• Product: Gentleman’s Resonated Catback V2
• Part Number: GRM.1025.2.0
• Fitment: 2015-2021 Subaru WRX, 2015-2021 Subaru STI
• Material: 304 Stainless Steel (exhaust components), 409 Stainless Steel (clamps)
• Finish: Brushed stainless steel
• Construction: TIG welded with dual-overlapping slip fit connections
• Origin: Not specified
• Power Gains: Supports increased flow for modified setups (no direct WHP claim)
• Tuning Required: Recommended for supporting mods
• Exhaust Tips: Quad 3.5-inch stainless steel tips
• Mid-Pipe: Resonated with dual-hanger design and stainless steel braided flex section

Key Benefits

• Performance: Enhanced exhaust flow with upgraded muffler cores and Y-splitter improves power potential on modified WRX/STI setups.
• Sound Quality: Balanced, refined tone with resonated mid-pipe reduces drone while maintaining a confident exhaust note.
• Fitment: Dual-overlapping slip fit connections and dual-hanger mid-pipe allow precise chassis-specific alignment for a perfect fit.
• Durability: Premium 304 stainless steel construction and TIG welding ensure long-lasting corrosion resistance and structural integrity.
• Adjustability: Slip fit clamps and flex section accommodate various exhaust configurations and reduce stress on components.
• Quality: Includes polyurethane exhaust hangers and a 2-bolt MLS gasket for secure installation and reduced movement.

What's Included

• 2× Grimmspeed Mufflers
• 1× Grimmspeed Y-Pipe
• 1× Grimmspeed Resonated Mid-Pipe
• 2× 2.5” Stainless Steel Double Overlap Slip Fit Clamps with Hardware
• 1× 3” Stainless Steel Double Overlap Slip Fit Clamp with Hardware
• 1× Grimmspeed 2-Bolt MLS Gasket
• 2× M10 Bolts
• 2× M10 Nuts
• 2× Grimmspeed License Plate Frames
• 1× Grimmspeed Decal
• Installation instructions

Installation & Compatibility

Installation of the Grimmspeed Gentleman’s Resonated Catback V2 is moderately complex due to the need for precise alignment and proper sealing of slip fit connections. While a knowledgeable enthusiast with basic hand tools can perform the install, professional installation is recommended to ensure optimal fitment and exhaust sealing. The included dual-overlapping slip fit clamps and dual-hanger mid-pipe design facilitate chassis-specific adjustments, but care should be taken to avoid exhaust leaks or misalignment.

• Professional Installation: Recommended
• Modifications Required: None; designed for direct bolt-on fitment
• Verify Compatibility: Confirm fitment for your specific 2015-2021 WRX or STI model and chassis

Tuning is recommended if combined with additional exhaust or intake modifications to optimize power delivery and maintain safe air/fuel ratios.

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