The BMW S68 combines twin-turbocharging with the performance hardware expected from BMW's latest high-output M models. With that level of performance, the exhaust system becomes an important part of the overall setup.

The MAD S68 Primary Catted Downpipes (MAD-162) are designed to improve exhaust flow while retaining catalytic converters. Originally developed around the S68-powered X5M and X6M platforms, the downpipes have been engineered for a range of newer BMW applications, including the G90 M5 and G99 M5 Touring.

By replacing the restrictive factory primary downpipes with a freer-flowing design, the system is intended to support improved turbo response, stronger performance potential, and a deeper exhaust note.

Improve Exhaust Flow Without Going Catless

The factory primary downpipes are designed around emissions control, refinement, and OEM operating requirements. For modified S68 vehicles, reducing restriction in this section can provide additional room for the turbochargers to move exhaust gases.

The MAD downpipes use a high-flow catted design rather than eliminating the catalytic converters altogether. This provides a performance-focused alternative for owners who want increased exhaust flow and a more pronounced exhaust note while maintaining catalysts in the system.

The improved flow can contribute to quicker turbo spool, sharper throttle response, and stronger midrange performance, depending on the vehicle's overall configuration and calibration.

A More Aggressive S68 Exhaust Note

The downpipes also change the character of the S68 exhaust system.

With the factory primary downpipes replaced by a higher-flow configuration, the exhaust develops a deeper and more purposeful tone. The catted design provides a more refined sound compared with a completely catless configuration, while still allowing the S68's exhaust note to become more prominent.

The catalytic converters can also help reduce exhaust odor compared with catless downpipes, although their presence does not by itself guarantee emissions compliance or prevent a check-engine light.

2.0mm 304 Stainless Steel Construction

MAD builds the S68 primary downpipes from 2.0mm-wall 304 stainless steel. This thick-wall construction is designed to withstand the high temperatures and demanding conditions associated with the S68's turbocharged exhaust system.

The downpipes are TIG welded and back-purged, producing consistent welds while helping maintain smooth internal surfaces. This attention to the inside of the tubing is particularly important in a component where exhaust flow is a primary concern.

The result is a durable construction designed for long-term use on high-performance S68 applications.

OEM-Style Fitment

The MAD downpipes are engineered as a direct bolt-on replacement for the factory components.

OEM-style brackets and flanges are used to provide precise positioning and simplify installation. No cutting or welding is required to install the downpipes, although professional installation is recommended.

Because BMW uses different configurations across S68 applications and model years, owners should verify the vehicle's flange style before ordering. MAD recommends providing the vehicle VIN if there is any uncertainty about compatibility.

Developed Across Multiple S68 Applications

The MAD S68 Primary Catted Downpipes were initially developed around the X5M and X6M, then expanded to cover additional S68-powered BMW models.

This includes the latest G90 M5 and G99 M5 Touring, as well as the S68-powered X5, X6, X7, and XM applications.

Fitment

X Series

• BMW X5 G05 LCI — 2022–2025, S68
• BMW X5 M F95 LCI — 2022–2025, S68; 2024+ USA
• BMW X6 G06 LCI — 2022–2025, S68
• BMW X6 M F96 LCI — 2022–2025, S68; 2024+ USA
• BMW X7 G07 LCI — 2022–2025, S68
• BMW XM G09 — 2021–2025, S68

M5

• BMW G90 M5 — 2025+, S68
• BMW G99 M5 Touring — 2025+, S68

These downpipes are compatible with both left-hand-drive and right-hand-drive vehicles, and they also fit applicable European-market models.

Important Fitment Notes

The MAD S68 downpipes are intended for LCI models where applicable and do not fit pre-LCI applications.

Because flange configurations can vary, it is important to verify the correct version before ordering. If you are unsure about your vehicle's configuration, provide the VIN to confirm fitment.

Additional tuning or supporting modifications may also be required depending on the vehicle and the rest of the performance setup.

Key Features

• High-flow catted primary downpipe design
• Designed specifically for BMW S68 applications
• Supports improved exhaust flow
• Potential for quicker turbo spool and sharper throttle response
• Deeper, more aggressive exhaust tone
• More refined sound than a catless configuration
• Reduced exhaust odor compared with catless downpipes
• 2.0mm-wall 304 stainless steel
• TIG welded and back-purged
• OEM-style brackets and flanges
• Direct bolt-on installation
• Part number: MAD-162
• Limited lifetime warranty
• Compatible with applicable LHD and RHD vehicles
• European-market compatible where applicable

Backed by a MAD Limited Lifetime Warranty

The S68 Primary Catted Downpipes are covered by MAD's limited lifetime warranty against manufacturing defects and fitment issues.

The combination of thick-wall 304 stainless steel, TIG welding, back-purging, and application-specific fitment is designed to provide a durable upgrade for high-performance S68 builds.

Emissions and Race-Use Notice

This product may not be legal for sale or use on pollution-controlled vehicles operated on public roads, highways, or streets. Unless specifically certified or exempted for a particular application, it is intended for off-road, racing, or closed-course competition use only where permitted.

The inclusion of catalytic converters does not guarantee emissions compliance, CARB compliance, or the prevention of a check-engine light.

Purchasers are responsible for verifying compliance with all applicable federal, state, local, and regional emissions laws before purchase and installation. Installation of aftermarket downpipes may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state or local regulations.

Upgrade the S68 Primary Downpipes

The MAD S68 Primary Catted Downpipes provide a high-flow alternative to the factory primary downpipes for a wide range of BMW's S68-powered vehicles. With high-flow catalysts, thick-wall 304 stainless steel construction, TIG-welded and back-purged tubing, and OEM-style fitment, the system is built around both performance and durability.

From the F95/F96 X5M and X6M to the latest G90/G99 M5, the MAD-162 provides a consistent approach to improving the exhaust side of the S68 while retaining catalytic converters.

Fitment: BMW G90 M5, G99 M5 Touring, F95 X5M, F96 X6M, G05 X5, G06 X6, G07 X7, and G09 XM applications as listed above.

Shop the MAD BMW S68 Primary Catted Downpipes: https://mad-us.com/mad-bmw-2024-s68-primary-catted-downpipes-g90-g99-m5-f95-f96-x5m-x6m-g05-g06-g07-g09/