Fabspeed 2025+ Chevrolet Corvette C8 ZR1 HJS 200-Cell Sport Racing Catalytic Converters

+91 HP | +141 LB-FT TQ | -20 LBS
Unlock significantly more performance from the C8 ZR1’s twin-turbo LT7 with the Fabspeed HJS 200-Cell Sport Racing Catalytic Converters. Engineered around genuine German-made HJS / EMITEC 200 CPSI tri-metallic catalysts, this system is designed to dramatically increase exhaust flow, reduce backpressure, improve turbo response, and deliver a much more aggressive exhaust note while retaining catalytic converters.
Fabspeed rates each catalyst for applications up to 1,200 horsepower and states the HJS cores flow approximately 90–92% as much as a straight pipe, making them an exceptionally high-flow option for the 1,064-horsepower ZR1.
 

Key Features

German-made HJS / EMITEC 200-cell catalytic converters
+91 HP & +141 LB-FT TQ
20 lb / 9.1 kg weight savings
Two high-flow 200 CPSI tri-metallic catalysts

Each catalyst rated for up to 1,200 HP

Manufacturer-rated at approximately 90–92% of straight-pipe flow

Improved exhaust flow and reduced backpressure
Faster turbo spool and transient response
Increased twin-turbo sound and whistle
More aggressive exhaust tone
Approximately 120.5 dB manufacturer sound measurement
Aerospace-grade T304L stainless steel

Fiber-optic laser fabrication
Back-purged TIG welding
CAD-designed and CNC-manufactured
2000°F / 1094°C ceramic-fiber insulation
625 Inconel double-wall heat blankets
No ECU tune required
Designed to operate without a catalyst-generated CEL
Direct bolt-on installation
No cutting or welding required
Made in the USA at Fabspeed’s Fort Washington facility

Fabspeed Lifetime Warranty

Dyno-Proven Performance
Fabspeed reports gains of:
+91 HP+141 LB-FT TQ
These Sport Cats are designed to free up exhaust flow upstream of the ZR1’s rear exhaust system, reducing restriction and allowing the twin turbochargers to respond more quickly throughout the RPM range.
Genuine HJS 200-Cell Racing Catalysts
At the heart of the system are two German-made HJS / EMITEC 200-cell tri-metallic catalytic converters.
Fabspeed states each catalyst is rated to support up to 1,200 horsepower, providing significant headroom for the factory LT7 as well as higher-output builds. The manufacturer also states the HJS cores flow approximately 90–92% of a straight pipe, offering very high exhaust-flow capability without eliminating the catalytic converters.
The catalysts are listed as EURO 6 homologated, with Fabspeed also describing them as European certified and TÜV approved.
Improved Turbo Response
Reducing exhaust restriction after the turbochargers can improve how efficiently the system evacuates exhaust gases. Fabspeed specifically claims quicker turbo spool-up and transient response, along with increased throttle response and more pronounced twin-turbo induction/exhaust character.
Lightweight T304L Stainless Steel Construction
The assemblies are constructed from aerospace-grade T304L stainless steel using precision laser fabrication and back-purged TIG welding.
Despite the large high-flow catalyst assemblies, Fabspeed reports a substantial 20 lb / 9.1 kg reduction compared with the factory components.
High-Temperature Heat Management
Each assembly uses ceramic-fiber insulation rated for temperatures up to 2000°F / 1094°C, surrounded by a 625 Inconel double-wall heat blanket to help contain the extreme heat generated around the ZR1’s turbocharged exhaust system.
More Aggressive LT7 Sound
The high-flow 200-cell catalysts allow significantly more of the ZR1’s exhaust character to come through while retaining catalytic converters.
Fabspeed describes the result as a deeper and more aggressive tone, along with increased turbo whistle and a stronger high-performance exhaust note. Manufacturer testing lists approximately 120.5 dB.
No Tune Required
Fabspeed states that no ECU tune is required and guarantees against a catalyst-generated Check Engine Light when used on the intended application.
Direct Bolt-On Installation
The Sport Cats are designed as a direct bolt-on replacement, requiring no cutting or welding.
Professional installation recommended.
Warranty
Backed by the Fabspeed Lifetime Warranty.
Vehicle Fitment
2025+ Chevrolet Corvette C8 ZR1

5.5L Twin-Turbo LT7 V8
Coupe
HTC / Convertible

Does NOT fit 2026+ C8 ZR1X. Fabspeed specifically states that this system is not cross-compatible with the ZR1X.
Emissions Information
Fabspeed describes these HJS / EMITEC catalysts as EPA compliant, EURO 6 homologated, certified, and TÜV approved. Customers should still verify that the product complies with all emissions, inspection, registration, and road-use requirements applicable to their specific vehicle and jurisdiction.