$595.00 USD
$595.00 USD


































The BMW X5M and X6M are already powerhouses in performance, but from the factory, the S63’s soundtrack leaves room for improvement. At Valvetronic Designs, “decent” isn’t enough—so we developed the ultimate valved exhaust system to amplify both performance and emotion.
Connecting directly to stock or aftermarket free-flow downpipes, this system features a 2.75-inch free-flow design from inlet to outlet, running completely unrestricted to the exhaust tips.
Valves Closed: Retains a refined, comfortable tone with no drone, perfect for daily use.
Valves Open: Unleashes an aggressive, motorsport-inspired roar with sharp gear-change snaps and a commanding presence.
Through testing, we found that an unresonated configuration produces the rawest and most exciting sound, delivering maximum character without sacrificing drivability.
Material: Premium T304 stainless steel for strength, durability, and corrosion resistance.
OEM Valve Integration: Retains factory electronic valve control for seamless operation.
Mandrel-Bent Tubing: Optimized for maximum flow and performance gains.
Precision TIG Welding: Ensures strength and a flawless finish.
2.75" diameter for improved flow
Available with your choice of 3.5" custom exhaust tips
9.8 lbs lighter than the factory exhaust
Electronic exhaust valves with factory-style control
100% reversible – return to stock at any time
2015–2018 BMW X5M F85
2015–2018 BMW X6M F86
This exhaust isn’t just an upgrade—it’s the transformation your X5M or X6M has been waiting for, bringing the S63 engine to life with the sound and presence it deserves.
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$595.00 USD
$595.00 USD
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
For a complete list of chemicals known to cause harm, visit https://www.p65warnings.ca.gov/chemicals.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell, install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB), it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local regulations before purchasing or installing emissions-related products.
All performance, racing, or competition parts sold by this company are intended solely for off-road, closed-course, or competition use on vehicles that are never registered or used on public highways.
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the use of emission-control defeat devices or any modification that violates the Clean Air Act or state regulations.