Exhaust Control Valve Kit

What Is an Exhaust Control Valve Kit?

Exhaust control valve kits give drivers direct command over one of the most defining characteristics of a performance vehicle: its exhaust note. Exhaust control valve kits consist of a butterfly-style valve mechanism integrated into the exhaust piping, along with the actuators, wiring harnesses, and control hardware needed to open and close that valve at will.

The concept is elegantly simple. A valved exhaust system features an internal valve mechanism that can open or close to change the flow of exhaust gases. When the valve is closed, gases are directed through the muffler's baffling, producing a quiet, refined tone suited to everyday driving. When the valve opens, gases bypass that restriction — unleashing the full, aggressive character of the engine. This dual-mode behavior makes valve kits especially appealing for drivers who need to keep noise levels civilized during a morning commute but want full theatrical effect on a weekend canyon run or track day.

Performance Benefits Beyond Sound

Sound control is the headline feature, but exhaust valve kits deliver tangible mechanical benefits as well. By reducing backpressure when the valve is open, the engine can breathe more freely, improving throttle response and horsepower output. Many modern performance cars — from Corvettes and BMW M cars to AMG Mercedes models — come factory-equipped with electronically controlled exhaust valves for exactly this reason. An exhaust control valve kit either integrates with those OEM systems or retrofits the same capability onto vehicles that didn't come with it from the factory.

Actuation methods vary by kit. Vacuum-operated systems use a solenoid and control box to generate the vacuum pressure that moves the valve. Electronic systems rely on motors or servo actuators driven by a wiring harness connected to the vehicle's drive-mode selector or a dedicated remote control. Many kits today also support smartphone app control, giving drivers a seamless, cockpit-free experience.

What to Consider When Shopping

• OEM Integration: Some kits are designed to tie directly into the factory drive-mode or ECU system, automatically opening and closing valves based on RPM, gear, and drive mode. Others are stand-alone and manually triggered.
• Single vs. Dual Valve: Dual-valve setups provide more symmetrical flow control on dual-exit systems, while single-valve kits are common on simpler configurations.
• Material Quality: Look for stainless steel valve bodies and corrosion-resistant hardware — exhaust components live in a harsh, high-heat environment.
• Vehicle-Specific vs. Universal Fit: Vehicle-specific kits offer plug-and-play installation and guaranteed compatibility. Universal kits offer flexibility but typically require custom fabrication work.
• Wiring & Hardware Completeness: Confirm what's included — some kits ship without wiring or require separate harness purchases for full functionality.

Top Brands in Exhaust Control Valve Kits

Akrapovic is the dominant name in this category, and for good reason. Founded in 1991, Akrapovic has built its reputation on world championship-winning exhaust technology, with over 100 world champions having relied on their systems. Their exhaust control valve kits — often marketed as Sound Kits or valve controller kits — are engineered to integrate seamlessly with specific Akrapovic exhaust systems, automatically driving rear exhaust valves based on engine speed, gear, and selected drive mode. The result is a precisely tuned dual-mode sound experience backed by Akrapovic's lifetime limited warranty.

Borla approaches exhaust control valves as a natural extension of their all-stainless exhaust ecosystem. Their control valve kits are purpose-built to add NPP-style dual-mode exhaust functionality to Borla systems that didn't originally ship with the necessary valves — a practical upgrade path for enthusiasts running popular platforms like the Chevrolet Camaro SS. Crafted from stainless steel and engineered to Borla's exacting American manufacturing standards, these kits are a trusted solution for unlocking the full versatility of a Borla exhaust installation.