Product Overview
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Brand：HMD
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Product Type：Variable-Valve Exhaust Syste(Catback)
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Product Name：Racing Grade catback Performance Exhaust pipe
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Vehicle Fitment：After placing your order, please send your vehicle details to customer service.
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Model Years：Please confirm exact model year before ordering
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Material：304 Stainless Steel
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Surface Finish：Polished/Brushed/Sandblasting Stainless Steel, depending on version
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Valve：The default valve body is the one shown in the image. If you wish to use the vehicle’s original control system, please contact customer service to receive a free replacement bracket compatible with the vehicle’s original valve motor.
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Welding Method：TIG Hand Welded
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Installation Type：Direct OEM Replacement Plug And Play No Cut No Weld
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Features Improve：Exhaust Flow and Reduce Backpressure
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Modification results：Improve Turbo Response and Exhaust Efficiency
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Installation Note：Professional installation recommended
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Logo Customization：Free Laser Logo Engraving
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Warranty：2 Year
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Place of Origin：Made in China
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Contact (WeChat/WhatsApp/kakao Talk)： +86 18924479531
Stainless Steel Valved Exhaust System—— The Smart Choice for Performance & Sound
一、Product Overview
What is a Valved Exhaust System?
A valved exhaust system, in simple terms, is an exhaust setup equipped with an adjustable valve mechanism that allows drivers to freely switch between two modes: "quiet and comfortable" or "aggressive and loud."
It Solves the Dilemma of Traditional Exhausts:
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Closed-Loop/Chambered— Base torque is sufficient, but exhaust flow becomes restricted at high RPM, limiting power output.
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Straight-Through— Strong horsepower at high RPM, yet noticeable low-end torque loss with loud noise.
Our Valved System Combines the Best of Both Worlds:
When the valve is closed, exhaust gas flows through a smaller diameter or single pipe, maintaining back pressure to preserve low-end torque. When the valve opens, gas flows through a larger diameter or dual pipes, reducing back pressure to unleash high-RPM horsepower.
二、Key Product Advantages
Premium Stainless Steel Construction
Crafted from high-grade stainless steel (sus304), our exhaust systems offer exceptional heat and corrosion resistance, ensuring long-term stability under extreme exhaust temperatures. sus304 grade withstands up to 1050°C, with precise wall thickness control for optimal weight reduction.
Flexible Control Options
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Remote Control Mode— Switch valve states with the included remote control for instant sound transformation
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OEM Control Mode—The system automatically adjusts based on RPM and throttle position, with user-defined activation points
Dual Enhancement – Performance & Sound
Valve Closed—Deep, mellow tone (~80-85 dB), near-stock level, ideal for city commuting and highway cruising
Valve Open—Unleashes an aggressive, high-pitched roar with sharper throttle response and smoother high-RPM power delivery
Bolt-on / Direct-fit Installation
Designed for direct bolt-on fitment with no cutting or welding required. 100% reversible for quick, hassle-free installation.
三、Application Scenarios
Daily Commute
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Valve: Closed
Quiet and comfortable with near-stock exhaust volume — perfect for city driving and highway cruising.
Weekend Canyon Runs / Track Days
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Valve: Open
Unleash the full potential of your engine with sharp high-RPM response and a roaring exhaust note — making every drive an exhilarating experience.
Late-night Returns
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Valve: Closed
One-touch switch to quiet mode — no more neighbor complaints during late-night arrivals.
Car Shows / Meetups
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Valve: Open
Aggressive sound that turns heads and showcases your unique taste in automotive modification.
四、Product List
Compatible Models: Alfa Romeo Giulia Quadrifoglio 2.9T
(If you are unsure whether this product is compatible with your vehicle, please contact customer service.)
Wireless Controller Set: 1 set
Screws and hardware
五、Why Choose Us?
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In-house factory production — quality controlled, competitive pricing
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Wide vehicle compatibility with custom options available
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Premium stainless steel — durable and rust-proof
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Comprehensive after-sales support
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OEM/ODM orders welcome
六、Contact Us
Interested in learning more or requesting a custom quote? Reach out to us
mail：OUCHIEXHAUST009@gmail.com
WhatsApp/kakao Talk：+86 18924479531