Kooks 3" SS Competition ULTRA X-Pipe. 06–13 Corvette C6 Z06/ZR1. Connects to OEM — 21613121

Unleash the full potential of your 2006–2013 Corvette C6 Z06 or ZR1 with a Kooks Competition-Only ULTRA X-Pipe engineered exclusively for LS7 and LS9 performance. 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.

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

• Competition-only ULTRA X design for maximum performance

• Full-length Long Merge for enhanced exhaust pulse scavenging

• Includes front connections to interface directly with Kooks Long Tube Headers

• 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

• Connects to 3" OEM (Z06/ZR1-Style) exhaust systems

• Competition-only use

Part number: 21613121

Vehicle application

2006-2013 Chevrolet Corvette Z06 7.0L V8, 2009-2013 Chevrolet Corvette ZR1 6.2L V8

Use restrictions

Competition use only. This part is not intended for use on public roads.

Kooks requires a waiver for this part before fulfillment.

WARNING: This product can expose you to chemicals including Chromium and Nickel, which are known to the State of California to cause cancer, birth defects or reproductive harm. For more information go to www.p65warnings.ca.gov

Professional installation available at League Motorsports — Los Angeles.

Financing available — Apply here.

Not sure what your fitment is? Contact us by phone at 213-372-5955, DM us on Instagram, or email info@leaguemotorsports.com.