3″ Stainless High Output GREEN Catted ULTRA X-Pipe for C6 Z06 & ZR1

Unleash the full potential of your 2006–2013 Corvette C6 Z06 or ZR1 with a Kooks H.O. GREEN catted ULTRA X-Pipe engineered exclusively for LS7 and LS9 performance, part number 21613421. Designed to integrate with 3″ OEM-style exhaust systems, this upgraded ULTRA X configuration uses a full-length Long Merge to improve scavenging, enhance top-end power, and deliver the unmistakable X/H-inspired tone Corvette enthusiasts love.

Equipped with H.O. GREEN catalytic converters, this system refines exhaust character while preserving the aggressive personality expected from a ULTRA X layout. Expect a crisp, exotic edge under acceleration complemented by a deeper, more composed mid-range resonance, providing a balanced, performance-driven sound that stands out without overwhelming rasp.

Crafted from premium 3″ stainless steel and built for maximum flow, this system pairs only with Kooks Long Tube Headers. When combined, they create a free-breathing, track-proven exhaust path that sharpens throttle response and amplifies the raw character of your naturally aspirated or supercharged V8. Expect a crisp, exotic edge on acceleration with the deeper mid-range resonance associated with blended X/H systems.

Features & Benefits

Hight Output GREEN Catted ULTRA X design for improved performance and a refined exhaust note
Full-length Long Merge for enhanced exhaust pulse scavenging
Includes front connections to interface directly with Kooks Long Tube Headers
High-flow catalytic converters for smoother, more controlled sound output
Mandrel-bent 3″ stainless steel tubing for optimized flow and long-term durability
CNC-built construction ensures precision fitment and consistent quality
Connects directly to 3″ OEM (Z06/ZR1-style) rear exhaust systems

Fitment Notes

Designed for 2006–2013 Corvette C6 Z06/ZR1 (LS7/LS9)
Requires Kooks Long Tube Headers (does not fit the oem exhaust manifolds)
Connects to 3″ OEM (Z06/ZR1-Style) exhaust systems
High Output GREEN Cats support up to 1000+ RWHP boosted or naturally aspirated

1000rwhp cats

Kooks ULTRA H.O. GREEN Catted X Pipe For C6 Z06 ZR1 21613421