The SLN 4" Non-Resonated Stainless Steel Single Mid Pipe is a premium exhaust upgrade designed to unlock the true acoustic potential and power of the BMW S58 engine. Replacing the restrictive factory dual-pipe layout with a massive single 4-inch merge dramatically improves exhaust gas flow and eliminates the unwanted high-RPM rasp inherent to the S58 engine platform.

Manufactured entirely from high-grade, TIG-welded stainless steel, this performance mid-pipe delivers a significantly deeper, highly aggressive exhaust note while maintaining civil daily drivability. To guarantee a perfect installation, the kit includes a custom-engineered heavy-duty replacement chassis under-brace designed to clear the enlarged 4-inch pipework while maintaining total structural rigidity.

Part Number: SLN_G80_MID_4

Key Features

– Massive 4.0-inch (101.6mm) single center section
– High-flow non-resonated design for maximum sound output
– Crafted from premium heavy-gauge TIG-welded stainless steel
– Mandrel-bent piping ensures smooth exhaust velocity
– Direct bolt-on fitment to OEM downpipes and rear axle-back system

Benefits

– Deep, aggressive, and crisp straight-six exhaust note
– Drastic reduction in backpressure for improved turbo response
– Completely eliminates the notorious S58 mid-range rasp
– Included custom clearance under-brace prevents underside rattles and rubbing

Dimensions

– Main Pipe Diameter: 4.0" (101.6mm)
– Material Thickness: 1.5mm heavy-gauge stainless steel
– Configuration: Single mid-pipe merge section

FAQ

Q: Will this mid-pipe trigger a Check Engine Light (CEL)?
A: Yes. Because this high-flow single mid-pipe deletes the restrictive factory secondary components, it will alter the variance readings on the factory sensors and trigger a CEL. A proper ECU tune, OPF delete module, or CEL deleter will be required to code it out.

Q: Is cutting required for installation?
A: Yes. Like almost all aftermarket mid-pipes for this platform, you must cut the factory one-piece exhaust system to slip and clamp this unit into place. Heavy-duty exhaust clamps are provided.

Q: Why does it include a replacement under-brace?
A: The stock BMW chassis brace is flat and leaves zero room for a 4-inch performance pipe. The included heavy-duty brace arches precisely over the new exhaust to maintain full structural integrity without any cabin vibration.

Fitment

– BMW G80 M3 (2021+)
– BMW G80 M3 Competition (2021+)
– BMW G81 M3 Touring Competition (2022+)
– BMW G82 M4 (2021+)
– BMW G82 M4 Competition (2021+)
– BMW G83 M4 Convertible (2021+)
– BMW F97 X3M LCI (2022+)
– BMW F98 X4M LCI (2022+)

If you are unsure on fitment, please message us with your registration or VIN and we will confirm compatibility before purchase.