New Turner E46 Valved Axle-Back & Cat-Back Exhausts

Transform your BMW E46 323/328 with the Turner Motorsport Valved Axle-Back Exhaust, engineered for lightweight performance, adjustable sound, and aggressive styling. Our valved muffler allows you to switch instantly between a refined, quiet tone for daily driving and a loud, spirited exhaust note for track days or spirited drives. Crafted from T304 stainless steel with integrated 3.0" exhaust tips, this axle-back system improves flow, reduces backpressure, and enhances throttle response. Designed in-house for perfect E46 323/328 fitment, it delivers a bold look, modern valved control, and the iconic straight-six sound you expect from Turner Motorsport.

PART DESIGN

Turner In-house designed and engineered using FARO ARM laser scanning technology and SolidWorks 3D CAD modeling for precision fitment.
T304 Stainless Material in a natural finish - 1.25mm wall thickness, back purged and TIG-welded throughout
2"-3.0" Stainless Steel Mandrel Bent Tubing
T304 Stainless Steel 12mm barbed exhaust hangers Tig-Welded in OE locations for precise fitment.​
23 lb weight reduction from factory catback
Designed for smoother flow path and less backpressure
KIT CONTENTS

Axleback exhaust
3.0" Valved muffler with integrated tips
Sleeve clamp to adapt to your factory exhaust front section
Optional exhaust valve controllers

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