GRM.1025.1.0 - GrimmSpeed “Gentleman’s Exhaust” V2 Catback System – Non-Resonated - Subaru WRX / STI (2015-2021)

A Return to Form, Refined

The GrimmSpeed Gentleman’s Exhaust is back, now redesigned to improve installation, dial in fitment, and maintain the refined tone that made the original system a go-to. Version 2 stays true to the “gentleman’s exhaust” philosophy, delivering a clean, controlled sound without the harshness or fatigue that comes with louder, less engineered systems.

This updated design introduces dual-overlapping slip fit connections and a revised dual-hanger mid-pipe, giving you significantly more adjustability during install. That means better alignment, tighter sealing, and the ability to fine-tune tip positioning exactly how you want it. Internally, the mufflers have been reworked with larger perforated cores and an updated Y-splitter to improve flow, while a carefully selected packing configuration ensures the tone stays consistent over time.

The non-resonated version is for those who want a more pronounced exhaust note, especially on otherwise stock turboback setups. It adds presence without losing the refined character that defines this system.

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

• Non-resonated configuration for a more aggressive exhaust note

• 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 Non-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

INSTALL GUIDE