G20/G22 M340/M440 Performance Valved Cat Back-Exhaust & Gloss Black Diffuser
Turner's Cat-Back Exhaust is meticulously engineered to deliver a rich, resonant exhaust note that transforms the character of your M340i. Utilizing the factory exhaust valve, this system lets you tailor the sound based on your drive mode—keeping things refined in Comfort mode, and unleashing a bold, free-flowing tone in Sport mode. The 3.0” T304 stainless steel construction ensures durability and rust resistance, while providing a significant 19-pound weight reduction from the factory exhaust.
Paired with Turner's signature straight-through muffler design, this cat-back maximizes airflow and minimizes back pressure, yielding both a performance boost and a thunderous tone when you hit the throttle.
Bold Aesthetics: Real Quad Tips & Gloss Black Diffuser
Factory-fitted faux tips don’t do the M340i justice. Turner's Cat-Back Exhaust replaces those with genuine quad 3.5" brushed stainless steel tips, delivering a genuine motorsport look. Complementing this upgrade, the included Gloss Black Diffuser offers a sleek, aggressive appearance, expertly crafted to fit perfectly and accommodate tips up to 4 inches.
Valved Performance: Adaptive valve control through factory modes for customizable sound levels Durable Build: 3.0” T304 stainless steel tubing, TIG-welded with precision, for long-lasting performance True Quad Exit: Brushed stainless steel tips, eliminating faux factory look Weight Savings: 19 lbs lighter than stock (factory system: 65 lbs; Turner exhaust: 46 lbs) Kit Includes:
3.0" front exhaust section with 80mm downpipe flange (compatible with factory and aftermarket downpipes) Free-flowing midsection and valved rear muffler for superior sound and reduced weight Quad 3.5" brushed stainless steel exhaust tips Valve extension harness, clamps, and hardware for seamless installation Turner Motorsport Gloss Black Rear Diffuser
Turner’s Gloss Black Diffuser provides a perfect OEM+ aesthetic to showcase the true exhaust upgrades on your M340i. Made from UV-stabilized ABS polymer, it’s designed to withstand the elements while adding a sporty, aggressive look. It’s engineered for precise fitment using factory mounting points, requiring no cutting or modification.
Precision Fitment: CAD-modeled and laser-scanned for perfect alignment OEM+ Styling: Complements the G20's lines with an upgraded motorsport feel Effortless Installation: Secure fitment with factory mounting locations; no drilling needed Compatible with Aftermarket Exhausts: Accommodates tips up to 4 inches Why Choose Turner Motorsport?
Turner Motorsport combines cutting-edge engineering with a deep commitment to quality. This cat-back exhaust system is designed and developed in-house to meet the needs of drivers who demand performance without compromise.
Make every drive an unforgettable experience with the Turner Motorsport G20 M340i Valved Cat-Back Exhaust and Gloss Black Diffuser. The sound, style, and performance upgrades you’ve been looking for are finally here—along with an exclusive offer to complete your setup.
Sound Clips! Featured on the ECS YouTube Channel HERE:
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This product was last offered at the strikethrough price on
05-05-2026
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Product Details
Turner's Cat-Back Exhaust is meticulously engineered to deliver a rich, resonant exhaust note that transforms the character of your M340i. Utilizing the factory exhaust valve, this system lets you tailor the sound based on your drive mode—keeping things refined in Comfort mode, and unleashing a bold, free-flowing tone in Sport mode. The 3.0” T304 stainless steel construction ensures durability and rust resistance, while providing a significant 19-pound weight reduction from the factory exhaust.
Paired with Turner's signature straight-through muffler design, this cat-back maximizes airflow and minimizes back pressure, yielding both a performance boost and a thunderous tone when you hit the throttle.
Bold Aesthetics: Real Quad Tips & Gloss Black Diffuser
Factory-fitted faux tips don’t do the M340i justice. Turner's Cat-Back Exhaust replaces those with genuine quad 3.5" brushed stainless steel tips, delivering a genuine motorsport look. Complementing this upgrade, the included Gloss Black Diffuser offers a sleek, aggressive appearance, expertly crafted to fit perfectly and accommodate tips up to 4 inches.
- Valved Performance: Adaptive valve control through factory modes for customizable sound levels
- Durable Build: 3.0” T304 stainless steel tubing, TIG-welded with precision, for long-lasting performance
- True Quad Exit: Brushed stainless steel tips, eliminating faux factory look
- Weight Savings: 19 lbs lighter than stock (factory system: 65 lbs; Turner exhaust: 46 lbs)
Kit Includes:
- 3.0" front exhaust section with 80mm downpipe flange (compatible with factory and aftermarket downpipes)
- Free-flowing midsection and valved rear muffler for superior sound and reduced weight
- Quad 3.5" brushed stainless steel exhaust tips
- Valve extension harness, clamps, and hardware for seamless installation
Turner Motorsport Gloss Black Rear Diffuser
Turner’s Gloss Black Diffuser provides a perfect OEM+ aesthetic to showcase the true exhaust upgrades on your M340i. Made from UV-stabilized ABS polymer, it’s designed to withstand the elements while adding a sporty, aggressive look. It’s engineered for precise fitment using factory mounting points, requiring no cutting or modification.
- Precision Fitment: CAD-modeled and laser-scanned for perfect alignment
- OEM+ Styling: Complements the G20's lines with an upgraded motorsport feel
- Effortless Installation: Secure fitment with factory mounting locations; no drilling needed
- Compatible with Aftermarket Exhausts: Accommodates tips up to 4 inches
Why Choose Turner Motorsport?
Turner Motorsport combines cutting-edge engineering with a deep commitment to quality. This cat-back exhaust system is designed and developed in-house to meet the needs of drivers who demand performance without compromise.
Make every drive an unforgettable experience with the Turner Motorsport G20 M340i Valved Cat-Back Exhaust and Gloss Black Diffuser. The sound, style, and performance upgrades you’ve been looking for are finally here—along with an exclusive offer to complete your setup.
Sound Clips! Featured on the ECS YouTube Channel HERE:
Prop 65 Warning
