Bmw F90,F92,F93, M5,M8 GMS/F90X/DP (2017-2020)

Upgrade your BMW M5 or M8 with G-tech Motorsports Decat Downpipes. Crafted from aircraft-grade stainless steel, these downpipes maximize flow, improve turbo response, and deliver a deep, aggressive exhaust note without compromise.

Key Features & Benefits

• Material: Aircraft-grade T304 stainless steel for durability
  
  

• Flow: Full 3-inch diameter with mandrel bends for consistent gas flow
  
  

• Construction: TIG welded in-house for strength and precision
  
  

• Performance: Faster turbo spool, sharper throttle response, increased power
  
  

• Sound: Aggressive tone with crackles under load, smooth on highways
  
  

• Weight Savings: Lighter than OEM catalytic converters, improves handling
  
  

Vehicle Compatibility / Fitment

• BMW F90 M5 (2018–2020, including Competition)
  
  

• BMW F92 M8 Coupe (2018–2020)
  
  

• BMW F93 M8 Gran Coupe (2018–2020)
  
  

• Fits original V-band clamps; PPF coding may be required for some cars
  
  

Technical Specifications

• Material: T304 stainless steel
  
  

• Diameter: 3 inches for max exhaust flow
  
  

• Bend: Mandrel-bent for consistent internal diameter
  
  

• Finish: Brushed stainless steel
  
  

• Welding: TIG welded for high-strength joints
  
  

• Weight reduction: Significant over OEM catalytic converters
  
  

Installation Information

• Tools required: Standard exhaust tools, torque wrench, optional Lambda spacers
  
  

• Estimated install time: 2–3 hours depending on experience
  
  

• Professional installation recommended for precise alignment and to prevent errors with PPF systems
  
  

Performance Gains / Why It’s Needed

GMS Decat Downpipes remove OEM restrictions, lowering backpressure and exhaust temperatures. This improves cylinder filling, turbo efficiency, and overall combustion, delivering 40–50 bhp gains on stock cars and up to 150–180 bhp with a Stage 2 ECU tune. Expect sharper mid-range torque, reduced turbo lag, and a more engaging driving experience.

What’s Included in the Kit

• Pair of GMS Decat Downpipes
  
  

• Fully TIG welded and mandrel-bent pipes
  
  

• Compatible with OEM V-band clamps
  
  

• Brushed stainless finish for durability and style
  
  

Warranty & Guarantee

• Backed by G-tech Motorsports manufacturer warranty
  
  

• Returns accepted for unused items in original packaging
  

Perfect BMW M5 and M8 performance upgrade, stainless steel decat downpipes, turbo back exhaust upgrade, exhaust tuning, and Stage 2 compatible. Pair with G-tech turbo inlets or intake systems for maximum performance.

FAQs

Q1: Will these fit stock exhaust setups?
Yes. They bolt directly to the turbo and midsection using original V-band clamps.

Q2: Do I need ECU tuning?
Gains are seen on stock ECU, but Stage 2 tune maximizes performance.

Q3: Is professional installation required?
Recommended due to alignment tolerances and possible PPF coding.

Q4: What sound changes can I expect?
Deeper, aggressive exhaust tone with crackles under load while remaining smooth on highways.

Q5: Will these reduce turbo lag?
Yes. The straight, mandrel-bent design improves turbo spool and throttle response.