Product Overview
Brand: HMD
Fitment: Alfa Romeo Giulia
Product Type: Variable-Valve Exhaust Syste(Catback)
Product Name: Racing Grade catback Performance Exhaust pipe
Vehicle Fitment: After placing your order, please send your vehicle details to customer service.
Model Years: Please confirm exact model year before ordering
Material: 304 Stainless Steel
Surface Finish: Polished/Brushed/Sandblasting Stainless Steel, depending on version
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.
Welding Method: TIG Hand Welded
Installation Type: Direct OEM Replacement Plug And Play No Cut No Weld
Features Improve: Exhaust Flow and Reduce Backpressure
Modification results: Improve Turbo Response and Exhaust Efficiency
Installation Note: Professional installation recommended
Logo Customization: Free Laser Logo Engraving
Warranty: 2 Year
Place of Origin: Made in China
Contact (WeChat/WhatsApp/kakao Talk): +86 18924479531
Stainless Steel Valved Exhaust System — The Smart Choice for Performance & Sound
1. 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:
Closed-Loop/Chambered— Base torque is sufficient, but exhaust flow becomes restricted at high RPM, limiting power output.
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.
2. 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
Remote Control Mode— Switch valve states with the included remote control for instant sound transformation
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.
3. Application Scenarios
Daily Commute
Valve: Closed
Quiet and comfortable with near-stock exhaust volume — perfect for city driving and highway cruising.
Weekend Canyon Runs / Track Days
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
Valve: Closed
One-touch switch to quiet mode — no more neighbor complaints during late-night arrivals.
Car Shows / Meetups
Valve: Open
Aggressive sound that turns heads and showcases your unique taste in automotive modification.
4. Product List
Compatible Models: Alfa Romeo Giulia
(If you are unsure whether this product is compatible with your vehicle, please contact customer service.)
Wireless Controller Set: 1 set
Screws and hardware
5. Why Choose Us?
In-house factory production — quality controlled, competitive pricing
Wide vehicle compatibility with custom options available
Premium stainless steel — durable and rust-proof
Comprehensive after-sales support
OEM/ODM orders welcome
6. Contact Us
Interested in learning more or requesting a custom quote? Reach out to us
mail: OUCHIEXHAUST009@gmail.com
WhatsApp/kakao Talk: +86 18924479531