HOLDEN COMMODORE/STATESMAN VP-VS IRS 2 1/2" REAR MUFFLER (DUAL OUTLET) (M7811) for Performance Car - Holden.
Category: Mufflers and resonators
This is the rear muffler on its own — the M7811 dual-outlet back box rather than a full kit: the HOLDEN-COMMODORE-STATESMAN-VP-VS-IRS-2-1-2-REAR-MUFFLER-DUAL-OUTLET-M7811 from Exhaust Systems Australia is a 2in rear muffler with twin outlets, listed for the IRS VP-VS Commodore and Statesman.
This is the rear silencer alone, not a complete system — the part you fit when the back box has rusted or blown and the rest of the exhaust is sound. Built on a 2in body, it sits at the tail of the IRS VP-VS Commodore and Statesman and finishes through a dual outlet, giving the back of the car a paired-pipe exit. As the rear box it sets the final note you hear behind the car.
A muffler quietens by absorbing and reflecting sound inside its body, and in the rear position it shapes the tailpipe character directly. The dual outlet changes how the gas exits at the very end while the silencing happens inside the box. There's no published sound figure, so the honest way to judge it is to hear a comparable IRS Commodore fit before deciding.
It's listed to fit the Holden Commodore and Statesman VP-VS with the independent rear end. Because the rear mounting and outlet position key to the IRS layout, confirm your exact model and rear-end type with the workshop before ordering — a live-axle car takes a different box.
Oak Flats Muffler Men supplies and fits this M7811 rear muffler in-house across the Illawarra. We hang it on the IRS rear mounts, set the two outlets even at the tail and join it square to the pipe ahead. Bring the car in and we'll confirm fitment and book the bay.
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.
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View partSend the vehicle make, model, year, engine, current issue, desired sound or performance goal, and clear photos of the existing exhaust where available.
