Unleash your Alfa Romeo Stelvio Quadrifoglio with Redstar Exhaust Stelvio Downpipes, purpose-built for the 2.9 F154 twin-turbo V6. These performance exhaust downpipes replace the restrictive factory downpipe sections to free up flow on the Quadrifoglio platform, targeting sharper response and stronger mid-range pull while preserving full compatibility with the Stelvio QV.

Developed using advanced CAD and motorsport-inspired fabrication, the flow-optimised, smooth-transition design reduces backpressure to help the twin turbos spool sooner and breathe more efficiently. Choose Redstar's OEM-style heat shielding option to cut radiant exhaust heat by up to 80%, supporting consistent performance and protecting surrounding components under the bonnet. The result is a noticeable increase in power potential, quicker throttle reaction, and a deeper, more assertive exhaust character.

Engineered for longevity, each system is crafted from premium 2.0mm wall 304L stainless steel, TIG welded and back purged, and equipped with OEM-spec V-band flanges. With all brackets and mounts mirroring the original equipment, installation is a true bolt-on, and the assembly is LHD and RHD compliant. Redstar downpipes deliver proven quality, precise fit, and the unmistakable Redstar focus on performance and refinement.

Available Options

• HJS HD 200cpsi Catalytic Converters: Engineered in Germany and trusted worldwide, the HJS 200cpsi ultra high-performance cats are rated for over 1000hp. Renowned for exceptional flow, durability, and consistent quality, these converters set the benchmark for high-output applications. Ideal for drivers demanding maximum performance without compromise.
• GESI GEN2 400cpsi Catalytic Converters: The latest GEN2 series from GESI is rated to support up to 1000hp while offering smoother exhaust flow and improved efficiency compared with factory units. Featuring advanced emissions technology for optimal catalyst function at high flow rates. A strong choice for those seeking significant performance gains with refined operation.
• OEM-Style Heat Shielding: Redstar's signature thermal management system reduces radiant exhaust heat by up to 80%. Developed with motorsport-inspired materials and construction, it uses a multi-layer design of ceramic insulation and embossed stainless steel foil. Unlike wraps or coatings that degrade quickly, Redstar shielding delivers long-term durability and consistent protection for engine bay components.
• Competition/Catless: Maximum flow design for uncompromised performance. Delivers the most aggressive exhaust note and optimal power gains. Track use only - not for road use.

Key Performance Benefits

• Significant power and torque gains from improved exhaust flow
• Faster turbo spool and crisper throttle response
• Lower under-bonnet temperatures for more consistent performance
• Deeper, more aggressive exhaust tone
• Helps promote longer turbocharger life
• 100% bolt-on installation

Technical Specifications

• 2.0mm wall 304L stainless steel construction
• 100% TIG welded and back purged
• OEM-spec V-band flanges
• Flow-optimised smooth transition design
• All brackets and mounts as on the OEM unit
• LHD and RHD compliant

Fitments

• 2017+ Alfa Romeo Stelvio Quadrifoglio 2.9L F154 twin-turbocharged V6