BMW Exhaust Parts, Mufflers & Catalytic Converters for BMW G82 M4 S58 3.0L

Here at Turner our mission was to amplify the G80/G82 with a proper catback exhaust system. To accomplish this goal, our engineers increased flow and delivered an exhaust system that captures the full unrestricted sound of the sonorous twin turbo inline-6 S58 engine. The increase in flow was gained from smooth flow path dual 3.0" stainless exhaust pipes that feed into one of the best designed mufflers on the market. Our engineers specifically designed the muffler with flow in mind to ensure that even with the exhaust valves closed, our muffler flows better and sounds better than the stock muffler. The best part of our Turner performance catback is the capability to control just how aggressive you want to your exhaust to sound, far beyond the point that the factory exhaust is able to perform. All of this plus the direct fitment and straight forward installation leads to our valved exhaust being the clear answer in your mission to find the best exhaust for your S58 powered G80 or G82.

The G80 took the world by storm by breaking the mold of BMW's standard design language. With the G80 and G82, a whole new generation of M car owners emerged. At first people were hesitant about the larger more distinguished front grilles, but after the shock was gone the true glory of BMW's newest M cars began to shine. The G80 M3 and G82 M4 are incredibly capable cars out of the box and Turner's large range of upgrades means the sky is the limit. Give your G80 or G82 the aggressive exhaust note that you wanted from the factory with Turner Motorsport's G80 G82 Stainless Valved Catback Exhaust.

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
3.0"OD Stainless Steel Mandrel Bent Tubing
T304 Stainless Steel 12mm barbed exhaust hangers Tig-Welded in OE locations for precise fitment.​
Strategically placed slip joints provide the most adjustability to obtain perfect fitment
Valved Muffler:
Optimized for superior flow over OEM
T304 Stainless Steel
Utilizes factory valve control
Performance:

Mid range torque and power increase 3600-4200 RPM
Torque gains: +14 ft/lbs @ 3850 RPM
Horsepower gains: +10 HP @ 3850 RPM
Smoother horsepower and torque delivery from 3000-6500 RPM ​
Performance Paired with Turner S58 Intake:

Mid range torque and power increase 3600-4200 RPM
Torque gains: +23 ft/lbs @ 3850 RPM
Horsepower gains: +17 HP @ 3850 RPM
Kit Contents:

Dual 3" Stainless Exhaust piping from secondary cats.
X pipe replacing middle muffler sections for better sound, performance and weight savings.
Valved muffler utilizing oem style exhaust valves
Optional Turner Slant Cut or Straight Cut Exhaust tips - 3.0" Inlet, 4.0" Outlet
Clamps and Hardware for an OEM+ install
Optional Exhaust Pipe Hanger Removal Pliers

Performance Catback Exhaust for pure unrestricted power and sound. This exhaust takes out all of the stop gates and pairs with the S58 for an iconic driving experience.

If you have driven an S58 car, even in stock form it feels like the sky is the limit.(If you haven't driven one, we are not sure why you are even looking into this exhaust)

When your driving an S58 equipped car such as the G80 M3 you can put your foot to the floor and it feels like the car would keep going and going, possibly with no limit. The G80 driving experience is great but there is always room for improvement. if dropping over 40lbs from just your exhaust and the gain in flow alone aren't enough to sell you, no problem. From enhancing the exhaust with smoother flow paths and taking out the bulky and restrictive muffler we saw gains up to 10hp and 14lb of torque on the stock ecu with zero tuning. Now that there are options for plug and play tunes as well as unlocking your ECU for custom tuning there is a much larger upside for power improvements. You will have to find the other restrictions holding you back from more power because it wont be the exhausts fault, this is as free flowing as it gets.

Here at Turner our mission was to amplify the G80/G82 with a proper catback exhaust system. To accomplish this goal, our engineers increased flow, reduced weight by 26lbs, and delivered an exhaust system that captures the full unrestricted sound of the sonorous twin turbo inline-6 S58 engine. The increase in flow was gained from dual 3.0" 304 stainless steel exhaust pipes that feed into straight-through free flowing rear section. We specifically designed this catback with flow in mind to ensure the exhaust would never be a restriction. Weight reduction is achieved by replacing the factory piping with lightweight 304ss for a more-than-modest weight advantage. The best part of the Race Inspired catback is the capability to perform far beyond the point that the factory exhaust. All of this plus the direct fitment and straight forward installation leads to our Turner Race Inspired Catback exhaust being the clear answer in your mission to find the best exhaust for your S58 powered G80 or G82.

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
3.0"OD Stainless Steel Mandrel Bent Tubing
T304 Stainless Steel 12mm barbed exhaust hangers Tig-Welded in OE locations for precise fitment.​
Strategically placed slip joints provide the most adjustability to obtain perfect fitment
Weight savings over the OEM exhaust system:
OEM Catback (without tips): 62 lbs
Turner Stainless Race Catback (without tips): 36 LBS!
26 lb weight reduction!
Performance:

Mid range torque and power increase 3600-4200 RPM
Torque gains: +14 ft/lbs @ 3850 RPM
Horsepower gains: +10 HP @ 3850 RPM
Smoother horsepower and torque delivery from 3000-6500 RPM
26 lb weight reduction for faster 0-60 ​
Performance Paired with Turner S58 Intake:

Mid range torque and power increase 3600-4200 RPM
Torque gains: +23 ft/lbs @ 3850 RPM
Horsepower gains: +17 HP @ 3850 RPM
All increases in power and torque were done a stock ECU with no tuning.

Kit Contents:

Dual 3" 304SS Exhaust piping from secondary cats.
X pipe replacing middle muffler sections for better sound, performance and weight savings.
Straight through "Race inspired" rear section
Optional Turner Slant Cut or Straight Cut Exhaust tips - 3.0" Inlet, 4.0" Outlet
Clamps and Hardware for an OEM+ install
Optional Exhaust Pipe Hanger Removal Pliers

Among the many reasons enthusiasts flock to the S58 is its unmistakable exhaust character. BMW’s twin-turbocharged inline-six delivers a fierce, motorsport-inspired snarl at wide-open throttle—yet the factory mid-section muffles much of that personality. The stock resonator and restrictive flow path tame the soundtrack, muting the aggressive tone your G8X M3/M4 is capable of producing.

Turner Motorsport set out to change that. Their Resonator Delete transforms the factory system with a direct bolt-on mid-section engineered to free both sound and performance. By removing the bulky OEM resonator, integrating a true x-pipe, and shedding roughly 5 lbs of unnecessary weight, this upgrade enhances exhaust scavenging, sharpens throttle response, and unleashes a deeper, more engaging tone. Best of all, it retains full compatibility with the OEM downpipes and valved rear muffler—delivering a noticeable sound improvement while preserving factory functionality and easy reversibility.

Features:

Deeper, more aggressive exhaust note with added character and minimal drone

X-pipe design promotes efficient exhaust scavenging for improved flow

Maintains OEM valved muffler operation for factory refinement

Approximately 5 lb weight reduction vs. the stock center resonator

Brushed 304 stainless steel construction with clean TIG-welded seams

Design:

1.25 mm-wall brushed 304 stainless steel tubing

76.2 mm (3") diameter

304SS sleeve-style and Accuseal clamps with slip-joint adjustability

Installation:

Installation is as easy as cutting your factory exhaust, raising the new center resonator delete into position, and clamping. Click HERE for Installation Instructions. Product Development:

Our Resonator Delete/X-Pipe was designed, engineered, tested, and quality inspected by our Research and Development team at Turner. Nothing but the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

Universal 2.5" inlet to 3.5" outlet exhaust tip. Priced per exhaust tip.

Over the years, it is not uncommon for exhaust tips to be damaged and corroded, becoming a "sore spot" of your BMW. To remedy this unsightly feature, we now offer our very own exhaust tips! Featuring stainless steel construction and a simple, yet sporty design, this exhaust tip will look perfectly at home on almost any model.

Features & Specifications:

Swivel feature for perfect alignment of the exhaust tips in the rear bumper
2.5" Inner Diameter
3.5" Outer Diameter
Brushed Aluminum Finish
Double Wall Construction
Angle Cut Style
Includes Stainless Steel Clamp