1 review
$5,000.00 USD

The all new design of the BMW G8X M-Performance exhaust features a race car like design with its Centre exit exhaust. Though it is said that the exhaust note is enhanced on the M-Performance model, it is still lacking the crisp tone that the S58 can produce. 

When developing the design for this system, we had two goals in mind. To offer G8X M-Performance model owners an exhaust system which provides immense weight savings with great power potential, and the great sound these vehicles deserve. But also, to offer those who don't have the M-Performance model to have access to a bespoke and high quality exhaust conversion kit. 

Valve Master presents to you our full catback conversion kit and exhaust system for the G8X platform. The S58 has been awaiting an exhaust which serves its purpose, to be loud, obnoxious, and unleash the true tone of the S58 motor without the rasp. Our single 4" midpipe is the perfect solution to this, this large diameter midpipe helps equalize the flow from the unequal cats, making rasp non-existent and produces a unique deep tone. This is the only 4" midpipe on the market, and provides maximum flow over other competitors exhausts and midpipes. Our system also utilizes 3" piping for the rest of the exhaust, unlike other competitors.This exhaust system utilizes the factory valve operation, with the valves closed, the exhaust note is tamed, much like OEM. With the valves open, you can experience the exhilarating S58 tone. For those looking for the best sound with dyno tested performance, look no further. 

For those looking to convert their G8X exhaust to the M-Performance style, we are now offering a full carbon diffuser and rear bumper lip set to complete the conversion to the center exit design. The diffuser will also fit the factory M-Performance vehicles looking for a carbon diffuser upgrade. The gloss carbon genuine carbon fiber diffuser and lip set provides an unprecedented upgrade for G8X owners. 



  • Full Catback System
    • Fits both M-Performance and non M-Performance models
  • Midpipe diameter 4" 
  • 3" mandrel bent and pie cut piping
  • Stainless is 18lbs lighter than the OEM system
  • Titanium is 50lbs lighter than the OEM system
  • All necessary hardware for installation
  • 4 Exhaust Tips for the rear (please choose from options)
  • Fits OEM & Aftermarket Downpipes 
  • Utilizes OEM valve function
  • Carbon Diffuser Available
    • For those looking to convert their G80 or G82 rear end to the M-Performance style 
    • For those with a factory M-Performance model looking for a carbon fiber upgrade


  • BMW M3 (G80) 
  • BMW M4 (G82) 
  • BMW M3 (G80) X Drive (2021+) 
  • BMW M4 (G82) X Drive (2021+) 
  • BMW M3 M-Performance (G80)
  • BMW M3 M-Performance (G82)
  • Carbon Diffuser will only fit G80 & G82 Models 



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