
Redback Performance Headers and 2.5" Exhaust System for Holden Commodore
Redback ExhaustsRRP$2613.75Redback Performance Headers and 2.5" Exhaust System.
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Redback Manifold Catalytic Converter.
Category: Extractors and headers

Listed to fit the Holden Astra from 2000, the Redback C4113 is a combined manifold and catalytic converter — the first length of pipe off the engine, with the converter built into the same casting rather than bolted on downstream.
Many small petrol cars of the Astra's era run a close-coupled converter, where the catalytic converter sits right behind the manifold to light off quickly from cold. Redback supplies that whole front section as one unit for the C4113, so a failed converter or a cracked manifold flange is fixed by renewing the assembly. The supplier lists no bore or material for it, and we don't put numbers to those.
It's listed to fit the Holden Astra from 2000. The Astra ran several engines across that period, and the supplier doesn't publish the series or engine for this listing, so we treat it as listed-to-fit and confirm it against your build before ordering. Bring the VIN and we'll line it up against the catalogue.
Because the C4113 is the catalytic-converter section, fitting it restores the Astra's emissions hardware rather than deleting it. Registrability still hangs on the condition of the full system, which we inspect on the hoist. We make no compliance claim the supplier hasn't stated.
Oak Flats Muffler Men handles Astra manifold-cat work in-house in the Illawarra. We verify the listing against your VIN, separate the old unit from head and downpipe, fit new gaskets, and reset any oxygen sensors the job disturbs. RRP is listed at 829 AUD; fitting is quoted on inspection.
Stocked and fitted by Oak Flats Muffler Men, the Illawarra exhaust and 4x4 specialist in Oak Flats, NSW.
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.