Milltek Sport Catalytic Converters with Heat Wrap – Compatible with 2020+ C8 Corvette

Description

The Milltek Hi-Flow HJS Sports Cats (part number SSXCH111) with heat wrap are a high-performance upgrade for the C8 Corvette Stingray, E-Ray, and Z06. These large-bore catalysts feature HJS 200 CPSI cores for significantly improved exhaust flow compared to stock cats, allowing gases to exit more efficiently. The motorsport-grade F1-style heat wrap helps manage underhood temperatures, and the system delivers power and torque gains across the rev range — all without throwing a check engine light or requiring a tune.

Fitment Notes

• Compatible with 2020+ C8 Corvette Stingray (6.2L LT2) and 2024+ C8 Corvette E-Ray (hybrid)

• Uses OEM GM gaskets for installation. 

• Tuning / ECU remap not required — designed to run without CEL when used with stock headers, intake, and throttle bodies.

Included

• Left-hand (LH) and right-hand (RH) cat assemblies (SSXCH111) with heat wrap for both sides

• Motorsports-grade F1-style heat wrap pre-installed on the cats 

• Mounting hardware

• Instructions / installation guide from Milltek

Product Specs

• Catalytic Core: HJS 200 CPSI, Euro 6 HD spec

• Material: 304L stainless steel

• Weight Reduction: ~10 lb lighter than OEM catalysts per Milltek spec sheet. 

• Thermal Management: Wrapped in F1-style motorsport-grade heat wrap for better heat control.

• Emission / Diagnostics: Designed to not trigger a CEL (check engine light) with factory ECU when installed with OEM components.

• Performance Gains: Milltek lists “increased HP and TQ across the entire powerband.” 

• Construction Origin: Made in UK (Milltek Sport legacy engineering)

Product Features

• High-Flow Catalyst Design – The 200 CPSI core boosts flow and reduces restrictions compared to stock cats, translating to real-world power gains.

• Motorsport-Grade Heat Wrap – F1-style thermal wrap minimizes heat soak, protecting nearby components and helping maintain lower under-hood temperatures.

• No Tune Required – Engineered to work with OEM headers and intake, without causing a CEL, making it a plug-and-play performance upgrade.

• Significant Weight Reduction – By shedding nearly 10 lb compared to factory converters, these cats contribute to reduced weight and improved throttle response.

• Durable Construction – Built from 304L stainless steel for long life and resistance to corrosion and thermal fatigue.

• Professional Heritage – Made by Milltek in the UK, leveraging decades of motorsport and performance exhaust experience.

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