BMW G90 M5 High Flow Downpipes

BMW G90 M5 High Flow Downpipes

Engineered for drivers who don't just want performance—they demand presence. This set of high flow downpipes for the G90 M5 removes the restrictive factory catalytic converters, unlocking the S68 twin-turbo V8's full potential with sharper spool, stronger mid-range, and a deeper, more aggressive exhaust note.

Pricing

• Catless: $859.99
• 100 Cell High-Flow Cats: $999.99
• 200 Cell High-Flow Cats: $1,199.99
• 300 Cell High-Flow Cats: $1,299.99

Fitment

• BMW G90 M5
• Direct bolt-on, no cutting or modification required
• Compatible with factory or aftermarket tuning
• Pairs seamlessly with factory or aftermarket catback systems

Sound Character

This system is built to amplify what makes the S68 special—its twin-turbo V8 character—while unlocking real performance gains.

• Catless: Maximum flow and maximum aggression. Pure motorsport character with pronounced turbo spool, sharp crackle on overrun, and the loudest, rawest tone in the lineup. Best suited for track use.
• 100 Cell: Aggressive, race-inspired tone with minimal restriction. Slightly more refined than catless while retaining most of the raw character and turbo noise.
• 200 Cell: A balanced middle ground—strong flow gains with a deeper, more controlled tone. Ideal for owners who want performance and daily-drivable refinement.
• 300 Cell: The most refined option in the lineup. Meaningful flow improvement over factory with a smoother, quieter tone and reduced drone—best for daily driving and emissions-conscious builds.

Materials & Engineering

• Constructed from premium T304 stainless steel for superior corrosion resistance and longevity
• Precision TIG-welded for structural integrity and clean aesthetics
• Mandrel-bent tubing ensures optimal exhaust flow and reduced backpressure
• High-flow cats (where equipped) maintain proper O2 sensor function and minimize check engine light concerns
• Designed to reduce weight vs. factory downpipes while improving turbo response

Performance Benefits

• Significantly increased exhaust flow for improved horsepower and torque
• Reduced backpressure for faster turbo spool and stronger mid-range pull
• Noticeable weight savings over OEM downpipe components
• Enhanced driving engagement through sound and responsiveness
• Ideal foundation for tuned builds looking to maximize the S68 platform

What's in the Box

• Full stainless steel high flow downpipe set
• High-flow catalytic converters (100/200/300 cell versions) or straight-through pipes (catless version)
• All required clamps, hardware, and gaskets
• Installation guide

Why This System

The G90 M5 already sits at the top of the performance sedan hierarchy—but from the factory, its restrictive catalytic converters hold back the S68's true potential. This system removes those limitations and unlocks the raw, emotional experience the platform was built for.

If you're the kind of owner who values precision engineering, track-ready performance, and a sound that turns every drive into an event—this is the upgrade that completes the car.