BMW G80 M3 G82 M4 G87 M2 S58 400-Cell Catted Downpipes

The IRL 400 Cell High-Flow Downpipes for the BMW G8X M2, M3 and M4 are engineered to cut exhaust restriction and improve turbo efficiency using 400-cell high-flow catalyst technology.

Why you need it

The downpipes are the first component in the exhaust, so freeing them up is one of the most effective S58 upgrades. Lower backpressure means faster turbo response, improved acceleration and stronger mid-range power. With the factory exhaust you get a deeper, cleaner tone and more pronounced turbo spool without excessive drone.

Fits

• BMW G8X M2, M3 and M4 (S58)

Features

• 400-cell high-flow catalyst cores
• Premium T304 stainless steel with mandrel-bent tubing
• Fully TIG-welded construction
• OEM-style oxygen sensor placement
• Direct bolt-on installation at factory mounting locations
• Built for high-boost and high-temperature use

Good to know

These downpipes are intended for off-road and motorsport use only, where permitted by law, and are not for registered road use. A check engine light may occur depending on vehicle software. New 2026 G8X models in particular may be more sensitive following BMW's latest software updates. ECU tuning may be recommended. Professional installation is recommended.