Valvetronic BMW G29 Z4 M40i Valved Sport Exhaust System

The Valvetronic BMW G29 Z4 M40i Valved Sport Exhaust System is the ultimate performance and sound upgrade for enthusiasts seeking full control over their driving experience. Engineered for the B58-powered Z4 platform, this system delivers a dramatic improvement in exhaust flow, sound quality, and overall driving engagement while maintaining everyday drivability.

Developed through extensive R&D on BMW B58 platforms including the Supra and M340i, this system is tuned to unlock the true character of BMW’s inline-six engine with a refined balance of aggression and comfort.

With electronically controlled valves, drivers can instantly switch between an aggressive motorsport-inspired exhaust tone and a quiet, OEM-like cruising mode. This makes the system ideal for both spirited driving and relaxed daily use.

Built from brushed T304 stainless steel and precision TIG welded construction, this exhaust system is engineered for long-term durability, corrosion resistance, and high-performance reliability.

Sound & Valve Control

• Valves Open
  Delivers a deep, aggressive exhaust note with enhanced turbo spool, sharp throttle response, and pronounced overrun suitable for spirited driving.
• Valves Closed
  Provides a refined, near-stock sound level ideal for highway cruising, urban driving, and quiet starts.

Performance Engineering

• Maximum Flow Design
  Single 3.5" midsection transitions into dual 3" mandrel-bent exhaust paths for optimized scavenging and reduced backpressure.
• Balanced Sound Profile
  Tuned specifically for the BMW B58 engine to produce a deep, full-bodied exhaust note inspired by Valvetronic’s Supra and M340i systems.
• Precision Construction
  TIG-welded T304 stainless steel ensures maximum strength, heat resistance, and long-term durability.

Features

• Valved catback exhaust system for full sound control
• Electronic-actuated valves for fast and reliable switching
• Valve controller kit included for plug-and-play operation
• Brushed T304 stainless steel construction
• Lightweight design, approximately 11.1 lbs lighter than OEM exhaust
• Mandrel-bent tubing for unrestricted exhaust flow
• Brushed Valvetronic exhaust tips for enhanced rear styling

Fitment

• 2017–2026 BMW Z4 M40i (G29 chassis)

Warranty Coverage

Valvetronic Designs products are guaranteed to be free from manufacturing defects in materials and workmanship at the time of sale. Coverage applies only to defects that affect proper function as intended for the specific application.

Fitment and function are guaranteed when installed on the intended vehicle without modification or structural damage. Exhaust tone or sound characteristics are not covered under warranty, as sound preference is subjective.

Warranty Periods

• 304 stainless steel and titanium exhaust tubes and welds: Lifetime limited warranty against manufacturing defects and penetrating rust
• Mufflers and resonators: 3-year limited warranty
• Catalysts: 25,000 miles or EPA compliance period for emissions and OBDII compatibility
• Catalytic converter shells and welds: 5 years or 50,000 miles
• Vacuum valves, actuators, and mechanical components: 1-year limited warranty
• Electronics including controllers and pumps: 1-year limited warranty
• Exhaust tip finish: 1-year limited warranty

Warranty Terms

• Coverage applies only to the original purchaser and is non-transferable
• Warranty begins on the original purchase date
• Discoloration from heat cycling, road salt, or environmental exposure is not covered under warranty

Included Components

• Valved catback exhaust system
• Electronic valve controller kit
• Brushed Valvetronic exhaust tips
• Full installation hardware package