This Exhaust Systems Australia system is listed to fit the Holden Commodore VT-VZ 5.7L Gen III V8, pairing tuned 1-3/4 headers and two cats with a twin 2-1/2 kit. The MPN is HOLDEN-COMMODORE-VT-VZ-5-7L-GENIII-TUNED-1-3-4-HEADER-CAT-X-2-X-2-1-2-KIT.
What does this part cover?
This is a tuned header-and-pipe system for the Holden Commodore VT to VZ on the 5.7L Gen III V8. It combines tuned 1-3/4 headers, two cats, and a twin 2-1/2 kit — so the extractors, the catalytic converters and the matching 2-1/2in dual pipework come together as a system rather than just the headers alone.
What's a tuned header-and-pipe kit and what does it change?
Extractors replace the cast manifolds with tuned-length tubes for a more even path off each bank; the twin 2-1/2 kit carries that through the rest of the system at a consistent pipe size, and the two cats keep the emissions hardware in place. A 1-3/4 primary is a common size for a 5.7L V8 of this era. The supplier publishes no power or sound figures, so we don't quote any.
Will it suit my Holden Commodore?
It's listed to fit the Holden Commodore VT through VZ with the 5.7L Gen III V8. Treat that as listed to fit rather than guaranteed, since feed data can be imperfect. Send the workshop your exact model and we'll confirm the headers, the two cats and the twin 2-1/2 kit suit your car before ordering.
Is it road legal?
This system runs two cats rather than deleting them, so it keeps the emissions hardware in the exhaust. Any state compliance requirements should still be confirmed against your specific vehicle with the workshop. Oak Flats Muffler Men supplies and fits Gen III systems across the Illawarra; at $1,535 AUD RRP it's a considered build, so book the bay and we'll fit it properly.
Stocked and fitted by Oak Flats Muffler Men, the Illawarra exhaust and 4x4 specialist in Oak Flats, NSW.
Common questions
What's included in this system?
Tuned 1-3/4 headers, two cats and a twin 2-1/2 kit for the VT-VZ Commodore 5.7L Gen III.
Does it keep the cats?
Yes — it runs two catalytic converters rather than deleting them.
What pipe size is the kit?
It's a twin 2-1/2 kit, carrying the dual system at 2-1/2in.
Fitment support across the Illawarra
Fitment checks near you across 18 Illawarra suburbs, from Oak Flats and Shellharbour to Wollongong and Kiama.Show nearby fitment areasCollapse section
Oak Flats Muffler Men can check this part against supplier specs, part number, image, RRP and vehicle details for customers around Oak Flats, Shellharbour, Wollongong, Dapto, Albion Park, Kiama and the northern suburbs.
Send the vehicle make, model, year, engine, current issue, desired sound or performance goal, and clear photos of the existing exhaust where available.