BMW For G-Series BMW M3, M4, M2 X3M/X4M LCI Downpipes

G-tech Motorsports 3.5” S58 Stainless Steel Decat Downpipes

For G-Series BMW M3, M4, M2 & X3M/X4M LCI

For Motorsport or Off-Road Use Only

Maximise the performance of your S58-powered BMW with the G-tech Motorsports 3.5” Decat Downpipes, engineered to deliver serious gains in power, response, and sound. Constructed from TIG-welded SS304 aircraft-grade stainless steel, these downpipes are built to perform under extreme conditions.

By removing the restrictive factory catalytic converters, these downpipes drastically reduce backpressure and allow your turbos to spool faster—resulting in sharper throttle response, lower exhaust gas temperatures, and significant power gains. The increased exhaust flow enhances the cylinder charge, helping the engine operate more efficiently at higher output.

The mandrel-bent 3.5” tubing ensures unrestricted flow while maintaining strong mid-range torque. A brushed stainless finish gives a clean motorsport appearance, and the included gaskets and bolts make installation straightforward for professionals.

Key Benefits:

• Constructed from SS304 aircraft-grade stainless steel

• 3.5” mandrel-bent design for optimal flow and performance

• TIG welded in-house for strength and precision

• Noticeable power and torque gains

• Deeper, more aggressive exhaust tone

• Faster turbo spool and sharper throttle response

• Lower EGTs and reduced backpressure

• Significant weight reduction vs. OEM cats

• Includes gaskets & bolts

• Brushed finish

• Lifetime warranty

Compatible with S58 Models Only:

• BMW M3 G80 (2020+)

• BMW M3 Touring G81 (2020+)

• BMW M4 Coupe G82 (2020+)

• BMW M4 Convertible G83 (2020+)

• BMW M2 G87

• BMW X3M LCI

• BMW X4M LCI

Fitment Notes:

These downpipes are designed to work with both OEM and aftermarket cat-back exhaust systems that retain factory flange positioning. If unsure about compatibility, please message us with your chassis number and our team will assist you.

Delivery:

We hold UK stock and offer fast shipping (2–3 working days) across the UK.

Disclaimer:

These downpipes are designed for motorsport or off-road use only. Professional installation is highly recommended.