$595.00 USD
$595.00 USD










































































F1-Inspired • RSR Sound • 9000 RPM Symphony
This system is truly unparalleled in sound quality. After over a year and a half of dedicated research and development, we’ve engineered an exhaust experience that must be heard to be believed.
When Porsche introduced the DFI engine in the 991 GT3, many feared it would lack the soul of the legendary Mezger. But with a screaming 9,000 RPM flat-six, Porsche delivered in spades. Still, the factory setup leaves much to be desired when it comes to rawness and that elusive F1-style sound.
At Valvetronic Designs, we’ve crafted a system that elevates your GT3 experience. Featuring 2.5-inch piping, a large stamped cross-section X-pipe, and added loop sections to lengthen the exhaust path, this setup achieves the high-pitch motorsport tone enthusiasts crave. Combine it with our free-flow headers, and your 991 becomes one of the most exhilarating sounding machines on the road.
This exhaust is designed to emulate the Porsche RSR race car:
Valves Open: An uncompromising sound experience with aggressive flames on upshifts and a crescendo that builds all the way to the 9000 RPM redline. Pure F1-inspired drama.
Valves Closed: Volume is tamed for comfort on long motorway drives or early-morning starts. Cabin drone is eliminated, keeping the experience refined even with valves shut.
Full 2.5-inch system from front to back
Large stamped cross-section X-pipe for F1 tone
Added loop sections for enhanced sound pitch
Optional free-flow headers for maximum performance and sound quality
Vacuum-actuated exhaust valves with factory-like operation
Precision TIG welds for high strength and durability
100% reversible – always able to return to stock
2014–2019 Porsche 991 GT3
2016–2019 Porsche 991 GT3 RS
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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.