Kooks Headers Catted Y-Pipe Performance Exhaust

The Kooks Headers Catted Y-Pipe is a performance exhaust connection pipe engineered to merge dual exhaust outlets from long tube headers into a single, optimized flow path — all while maintaining emissions compliance through integrated high-flow catalytic converters. Designed as a direct companion to Kooks long tube headers, each catted Y-pipe in this lineup is purpose-built to reduce backpressure, improve exhaust scavenging, and deliver real, measurable gains in horsepower and torque across the full RPM range.

Key Features:

• T304 Aircraft-Quality Stainless Steel Construction — Every Y-pipe is built from the same high-alloy stainless steel used throughout the Kooks lineup, providing superior corrosion resistance and long-term high-temperature durability
• Integrated High-Flow Catalytic Converters — Built-in cats deliver emissions-compliant performance with minimal exhaust restriction; standard high-flow cat variants are suited for naturally aspirated applications, while Green Cat variants are engineered to support forced induction and high-horsepower builds up to 900 hp
• Mandrel-Bent Tubing — Smooth, consistent-diameter bends maintain optimal exhaust velocity through the merge with no pinching or turbulence-inducing restriction
• TIG-Welded Assembly — Precision welds throughout ensure a leak-free, crack-resistant build that holds up under sustained high-heat conditions
• OEM-Compatible Connection Points — Engineered to mate directly with factory exhaust connection points, allowing the outlet to reconnect to the OEM exhaust using existing hardware for a clean, bolt-on installation
• Ball-and-Socket Header Connection — Provides a secure, self-aligning connection to Kooks long tube headers that accommodates minor alignment variations and resists exhaust leaks
• Dyno and Race Tested — Every design is validated for maximum power output before leaving Kooks' Statesville, NC manufacturing facility
• Handcrafted in the USA — Individually built by skilled craftsmen at Kooks' independently owned and operated facility, now in its third generation of family leadership
• Limited Lifetime Warranty — Backed by Kooks' limited lifetime warranty to the original purchaser

Available Catalyst Options:

• Standard High-Flow Cats — Recommended for street-driven, naturally aspirated applications; provide a deeper exhaust tone with little to no horsepower loss compared to restrictive OEM catalysts
• Green Cat (Ultra High-Performance) — Kooks' premium catalyst option, designed for naturally aspirated and forced induction engines; engineered to handle elevated exhaust temperatures and flow demands while helping eliminate most check engine light warnings

Since 1962, Kooks Headers and Exhaust has been a benchmark of performance exhaust quality in professional motorsports, earning hundreds of championships across NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA, and numerous other sanctioning bodies. This product line is available in multiple configurations — select the correct variant for your specific application to get the right tube diameter, catalyst type, and connection configuration for your build.

Note: Emissions compliance varies by region. Check your state and local laws before purchasing. California residents should refer to CARB regulations regarding aftermarket exhaust components.