Valvetronic Stainless Steel Valved Sport Exhaust System For G29 BMW Z4 M40i

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

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.

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

Fitment

• 2017+ BMW G29 Z4 M40i