BMW Z4 M40i Valved Exhaust System

3.5″ Midpipe, Dual 3″ Axle-Back, Vacuum Valves

Overview

The Valvetronic Designs Valved Exhaust System for the BMW G29 Z4 M40i is the ultimate upgrade for enthusiasts who demand both performance and versatility. Developed from our extensive R&D on B58-powered platforms—including the Supra and M340i—this system transforms the Z4’s sound and performance, unlocking the true potential of BMW’s celebrated inline-six.

Sound & Control

• Valves Open: A rich, aggressive tone with crisp throttle response, pronounced turbo spool, and motorsport-inspired overrun.

• Valves Closed: A refined, stock-like sound perfect for long cruises or early-morning starts—ideal when you want performance without the attention.

Performance Engineering

• Maximum Flow Design: Single 3.5″ midsection transitioning into dual 3″ mandrel-bent runs for optimal exhaust scavenging and reduced backpressure.

• Balanced Sound Profile: Tuned for a deep, full-bodied note inspired by our acclaimed B58 Supra and M340i systems.

• Precision Construction: TIG-welded T304 stainless steel for exceptional durability and corrosion resistance.

Fitment

• 2017+ BMW G29 Z4 M40i

Features

• Fully mandrel-bent for maximum flow

• Precision TIG welds for high strength

• Built from T304 stainless steel

• Electronic-actuated valves for rapid and reliable operation

• 11.1 lbs lighter than the factory exhaust

• Beautiful tips to complement the Z4’s styling

• 100% reversible—return to stock at any time