GrimmSpeed “Gentleman’s Exhaust” V2 Catback System – Resonated - 15-21 WRX, 15-21 STI

A Return to Form, Refined

The GrimmSpeed Gentleman’s Exhaust returns with a redesigned Version 2 layout focused on fitment, longevity, and maintaining a clean, refined exhaust note. Built around the original “gentleman’s exhaust” concept, this system delivers a balanced tone that avoids drone while still providing a strong, confident presence.

Key updates include dual-overlapping slip fit connections and a revised dual-hanger mid-pipe, allowing for greater adjustability during installation and more precise alignment on a per-chassis basis. Internally, the upgraded muffler design features larger perforated cores and an improved Y-splitter to increase flow, paired with a durable packing configuration that resists breakdown over time.

The resonated version is ideal for drivers planning additional exhaust modifications. It helps maintain a smoother, more controlled sound profile as airflow increases throughout the system, making it the better choice for more heavily modified setups.

Quick Specs

• 304 stainless steel construction for all exhaust components

• 409 stainless steel double-overlap slip fit clamps

• TIG welded construction for strength and consistency

• Custom mufflers with twin-tube perforated core design for increased flow

• Updated internal Y-splitter and long-life packing material to maintain tone over time

• Quad 3.5-inch exhaust tips

• Resonated mid-pipe for smoother, more controlled exhaust tone

• Dual-overlapping stainless steel slip fit connections for improved sealing and adjustability

• Dual-hanger mid-pipe design for chassis-specific fitment dialing

• Stainless steel braided flex section for compatibility across exhaust setups

• Includes polyurethane exhaust hangers for added stability and reduced movement

• Includes 304 stainless steel 2-bolt MLS gasket

Fitment

• 2015–2021 Subaru WRX (VA Chassis)

• 2015–2021 Subaru STI (VA Chassis)

What’s in the Box

• 2x GrimmSpeed Mufflers

• 1x GrimmSpeed Y-Pipe

• 1x GrimmSpeed Resonated Mid-Pipe

• 2x 2.5” Stainless Steel Double Overlap Slip Fit Clamps with Hardware

• 1x 3” Stainless Steel Double Overlap Slip Fit Clamp with Hardware

• 1x GrimmSpeed 2-Bolt MLS Gasket

• 2x M10 Bolts

• 2x M10 Nuts

• 2x GrimmSpeed License Plate Frames

• 1x GrimmSpeed Decal