Valved Cat-Back Exhaust - E46 323/328

Product Details

When we set out to build an exhaust for the BMW E46 323/328, we knew it needed to match how you drive and how you want your car to sound. We also know that while many drivers wish for an aggressive, head-turning exhaust note, they don’t always want the volume all the time. That’s why we engineered this lightweight Turner Motorsport performance exhaust system with a fully valved muffler, giving you the ability to switch between a refined, quiet tone and a loud, spirited sound at any moment.

Our new Turner Cat-Back Exhaust is the first valved rear section designed specifically for the E46 323/328. With the included remote controller, you can change your exhaust tone with a simple click. With the valve closed, the system delivers a smooth, deep, tasteful note for daily driving. Open the valve, and you unlock an aggressive, free-flowing exhaust tone that brings out the full character of the M52 engine, perfect for track days or anytime you want maximum sound and performance.

For maximum flow and durability, we built this system using dual 2.0" T304 stainless steel mid-pipes that bolt directly to your factory downpipes. Inside the mid-section, we integrated an X-pipe to balance exhaust pulses, reduce backpressure, increase performance, and smooth the exhaust note. The dual 2.0" mid-pipes merge into a 3.0" axle-back section and a full 3.0" valved muffler, finished with bold 3.0" integrated tips that perfectly fill the E46 rear bumper.

Modern performance cars use valved exhaust systems as standard equipment, but the E46 never truly benefited from that technology. Some early E46 models used a basic vacuum-controlled valve, but after nearly 20 years, most are no longer functional. By studying BMW’s original concept and improving it with modern engineering, we created a lightweight, high-performance valved exhaust that gives your BMW E46 323/328 modern sound control, better flow, and a dramatically enhanced driving experience.

Part Design & Engineering

• In-house Turner Motorsport design using FARO ARM laser scanning and SolidWorks 3D CAD for precise BMW E46 fitment
• T304 stainless steel construction with 1.25mm wall thickness, TIG-welded and back-purged for superior strength
• 2.0"–3.0" mandrel-bent stainless tubing for optimal flow and performance
• T304 stainless 12mm barbed hangers TIG-welded in OE locations for perfect alignment
• Direct-fit flanges engineered to bolt to factory BMW 323/328 downpipes
• Over 20 lbs lighter than the factory cat-back exhaust
• Designed for smoother flow, reduced backpressure, and improved exhaust tone

Kit Contents

• 2.0" Mid-section with integrated X-pipe
• New center exhaust brace
• 3.0" valved muffler with integrated 3.0" tips
• Valve controller with installation kit and two remote fobs
• New downpipe hardware to replace seized factory studs
• All required gaskets, clamps, and installation hardware

PRODUCT DEVELOPMENT

Our E46 323i/328i Performance Exhausts are the result of advanced engineering, testing, and quality assurance by Turner’s Research & Development team. Every stage of development employs FARO laser scanning, SolidWorks 3D CAD modeling, and in-house rapid prototyping for precise fitment and design validation. Performance and durability are proven through Mustang AWD 500 SE dyno testing and Superflow SF-750 Flowbench analysis, ensuring each component meets Turner’s uncompromising standards for performance and quality.

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