Milltek HJS Hi-Flow Sports Cat (w/ Heat Wrap) | Chevrolet C8 Corvette Z06

Description

Milltek's HJS Hi-Flow Sports Cat for the Chevrolet Corvette C8 Z06 is a high-flow catalyst upgrade that swaps the restrictive factory cats for HJS high-flow units in T304L stainless, freeing up the flat-plane 5.5 V8 for sharper response and a harder note. It is built for Z06 owners chasing flow and sound gains at the source, and fits directly in place of the OEM catalysts. What is the HJS Hi-Flow Sports Cat for the C8 Z06? It is a high-flow catalyst section that replaces the OEM cats with HJS-branded high-flow cores, built in hand-finished T304L stainless. This heat-wrapped version (SSXCH111) adds a thermal wrap to help manage under-body heat; the standard version (SSXCH110) is the unwrapped option. HJS cores are chosen for a balance of flow and emissions-focused catalyst quality. Who is it for? It suits the C8 Z06 owner who wants to reduce exhaust restriction at the catalyst and sharpen the flat-plane V8 sound, rather than only changing the rear tips. Pair it with a cat-back for the fullest effect. What does it include and what are the specs? The system ships as a direct-fit high-flow catalyst section with HJS cores, thermal heat wrap and OEM-compatible connections. Material T304Lstainless, hand-finished Pipe diameter 3" (76.2mm) Catalyst HJS high-flow sports cats Options With heat wrap (SSXCH111) or without (SSXCH110) Fitment Chevrolet Corvette C8 Z06, 2023 and later Install Direct fit in place of OEM catalysts What are the limitations, and who is it NOT for? This is a high-flow sports-cat section, not a decat, and it works best combined with a matching cat-back. Check emissions rules for your state before fitting high-flow cats. It changes flow and tone at the catalyst; it is not a full power-package on its own. Every system is built in hand-finished T304L stainless. (Source: Milltek Sport, About Us.) Last updated: 2026-07-01. Designed in Tennessee and manufactured in the UK with 40+ years of performance exhaust heritage. Tested on the Tail of the Dragon.

Fits 8 vehicles including:

• 2020 Chevrolet Corvette— Stingray (C8) 6.2L V8 & E-Ray Hybrid (Non-OPF/GPF Models) > 2020 and Later
• 2021 Chevrolet Corvette— Stingray (C8) 6.2L V8 & E-Ray Hybrid (Non-OPF/GPF Models) > 2020 and Later
• 2022 Chevrolet Corvette— Stingray (C8) 6.2L V8 & E-Ray Hybrid (Non-OPF/GPF Models) > 2020 and Later
• 2023 Chevrolet Corvette— Stingray (C8) 6.2L V8 & E-Ray Hybrid (Non-OPF/GPF Models) > 2020 and Later / C8 Z06 > 2023 and Later
• 2024 Chevrolet Corvette— Stingray (C8) 6.2L V8 & E-Ray Hybrid (Non-OPF/GPF Models) > 2020 and Later / C8 Z06 > 2023 and Later
• 2025 Chevrolet Corvette— Stingray (C8) 6.2L V8 & E-Ray Hybrid (Non-OPF/GPF Models) > 2020 and Later / C8 Z06 > 2023 and Later
• + 2 more vehicles