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