Overview

The S55 engine in the M2 Competition and M2 CS delivers exceptional performance, but its stock exhaust note leaves much to be desired-buzzy, raspy, and lacking the refined aggression enthusiasts expect. The Valvetronic Designs Equal-Length Valved Cat-Back Exhaust System solves this problem, unlocking the hidden character of the S55 while preserving the excitement and volume owners crave.

This system combines a 2.75-inch equal-length mid-section with an H-pipe and a 3.5-inch axle-back, delivering a smoother, richer tone across the rev range. With valves open, exhaust gases exit freely through the passenger-side tips for maximum presence. With valves closed, gases are routed through our quad-chamber muffler and driver-side tips, offering a quieter, more refined sound-perfect for daily driving.

Direct bolt-on fitment means installation is seamless, mounting to factory points without permanent modifications.

Why It Works

• Equal-Length Mid-Section: Balances exhaust pulses for a smoother, more pleasant tone without sacrificing aggression.

• H-Pipe Integration: Improves exhaust scavenging for a fuller, richer sound.

• Dual Sound Modes: Enjoy raw, motorsport tone (open) or comfortable refinement (closed).

Sound & Control

• Valves Open: Aggressive, free-flowing tone with improved top-end character.

• Valves Closed: Stock-like volume and tone for discreet driving.

• Electronic Valve Control: Includes remote controller; OEM valve integration optional.

Construction & Options

• Materials: T304 stainless steel or Grade 5 titanium.

• Weight Savings: –20.9 lb (Stainless) / –47.3 lb (Titanium) compared to OEM.

• Craftsmanship: Precision TIG welds, fully mandrel-bent tubing.

• Tips: Premium tips available in multiple finishes to match your style.

Fitment

• 2018+ BMW F87 M2 Competition

• 2020 BMW M2 CS

Installation Notes

• Direct bolt-on installation to OEM mounting points.

• 100% reversible-return to stock at any time.

• Note for S55 Owners: On race or free-flow downpipes, “2k rpm rasp” may be present during low-rpm shifts. For the most refined tone, we recommend high-flow (200 cell) catalytic converters.

What’s Included

• 2.75" equal-length H-pipe mid-section

• 3.5" axle-back with quad-chamber muffler

• Electronic valve system with controller (OEM integration optional)

• All required clamps and hardware

Specifications

• Mid-Section Diameter: 2.75" equal-length with H-pipe

• Axle-Back Diameter: 3.5"

• Material: T304 stainless steel or Grade 5 titanium

• Valves: Electronic, rapid open/close

• Weight Savings: –20.9 lb (Stainless) / –47.3 lb (Titanium) vs. OEM

• Design: Quad-chamber muffler for refined closed-valve tone