KAOS Stainless Steel Catback Exhaust - 2018+ BMW X3M / X4M
KAOS Stainless Steel Catback Exhaust - 2018+ BMW X3M / X4M
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The X3M doesn’t just deserve a louder voice—it needs one. Our valved axle-back system, paired with a single midpipe design, amplifies the raw, unmistakable tone of BMW’s inline-6—deeper, sharper, and far more aggressive than stock. Open the valves and it’s pure chaos. Close them and you’re back to civilized—sort of. Built from T304 stainless and designed using full 3D scans, it fits like factory but sounds nothing like it. Lighter, louder, and engineered for daily madness without the drone. This is what your M should’ve sounded like from day one.
Features:
- Louder, more aggressive sound–with zero drone
- Single midpipe design amplifies the signature BMW inline-6 sound
- Valve-controlled chaos: violent when open, stealthy when shut
- Built from 100% T304 stainless steel with pro-grade TIG welds
- Engineered using 3D scans for perfect fitment and a clean, OEM+ fit
- Direct bolt-on installation with complete hardware mounting kit
- Lighter than stock for a slight edge in performance
- Comes standard with a free HOA violation
The Majority of our products are in stock. Once your order is placed, all products are shipped via standard ground service, which typically takes 5–7 business days for delivery.
In the event that we currently do not have stock, please allow up to 2 weeks for production.
Free shipping is included on all orders within the continental United States.
Due to the custom nature of our products, all sales are final. We do not accept returns or exchanges unless the item arrives damaged or defective. If there’s an issue with your order, please contact us immediately so we can make it right.
All KAOS products are intended for off-road or track use only. They are not certified for street use and may not comply with local, state, or federal emissions or noise regulations. It is the customer’s responsibility to ensure compliance with applicable laws before installing or using our products.
By purchasing from KAOS, you acknowledge that these parts may alter your vehicle's emissions, sound level, and performance characteristics. Use at your own risk.
The Majority of our products are in stock. Once your order is placed, all products are shipped via standard ground service, which typically takes 5–7 business days for delivery.
In the event that we currently do not have stock, please allow up to 2 weeks for production.
Free shipping is included on all orders within the continental United States.
Due to the custom nature of our products, all sales are final. We do not accept returns or exchanges unless the item arrives damaged or defective. If there’s an issue with your order, please contact us immediately so we can make it right.
All KAOS products are intended for off-road or track use only. They are not certified for street use and may not comply with local, state, or federal emissions or noise regulations. It is the customer’s responsibility to ensure compliance with applicable laws before installing or using our products.
By purchasing from KAOS, you acknowledge that these parts may alter your vehicle's emissions, sound level, and performance characteristics. Use at your own risk.
Questions about an exhaust?
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