Kooks Headers Catted H-Pipe with GREEN High-Flow Catalytic Converters

The Kooks Headers Catted H-Pipe with GREEN High-Flow Catalytic Converters is an emissions-compliant crossover solution engineered to pair seamlessly with Kooks long tube header systems. Built by a brand that has led the high-performance exhaust industry for over 50 years, each H-pipe in this lineup combines proven crossover technology with street-legal catalytic converters — delivering maximum exhaust scavenging, reduced backpressure, and real-world power gains without sacrificing emissions compliance.

Kooks GREEN High-Flow Catalytic Converters

At the heart of this product line are Kooks' proprietary GREEN catalytic converters — EPA-verified high-flow units built on a 400-cell substrate engineered to minimize harmful emissions while preserving aggressive exhaust flow. The enhanced precious metal coating helps each converter withstand elevated heat levels common in high-horsepower and forced-induction applications, making GREEN cats a capable choice well beyond naturally aspirated builds. The lineup spans standard GREEN, Ultra-GREEN, and High Output GREEN variants to address a wide range of performance requirements.

Key Features:

• EPA-verified GREEN high-flow catalytic converters reduce emissions without compromising performance
• 400-cell high-flow substrate balances emissions compliance with maximum exhaust flow
• Suitable for forced-induction applications — GREEN cats are engineered to handle the increased heat and flow demands of supercharged and turbocharged engines
• H-pipe crossover configuration balances exhaust pulses between cylinder banks for smoother power delivery and improved throttle response
• T304 aircraft-quality stainless steel construction ensures long-term corrosion resistance and durability
• Precision mandrel-bent tubing maintains consistent internal diameter throughout for unrestricted exhaust flow
• Laser-cut, CNC-machined flanges deliver accurate fitment and leak-free sealing
• TIG-welded construction throughout for structural integrity and lasting performance
• Connects to OEM-style exhaust for straightforward installation with all necessary hardware included
• Dyno and race-tested design engineered for maximum power output across the full RPM range
• Limited lifetime warranty to the original purchaser
• Handcrafted in the USA at Kooks' facility in Statesville, NC

Since 1962, Kooks Headers and Exhaust has built its reputation through hundreds of championships and records across NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA, and other major motorsports organizations. Now in its third generation of family ownership, every Kooks product is built by hand in the United States. The Catted H-Pipe line reflects that same commitment to craftsmanship — giving performance enthusiasts a street-legal crossover solution held to the same standards trusted by professional racers worldwide.