The Mega Flow M4938 (HOLDEN-COMMODORE-VS-V6-WAGON-2-1-2-CENTRE-MUFFLER-MEGA-FLOW-M4938) is the wagon-specific centre muffler from Exhaust Systems Australia for the Holden Commodore VS V6. Its routing and length are shaped for the longer-bodied wagon, where the floorpan and rear overhang differ from the sedan.
Why a wagon-specific centre muffler?
The VS wagon carries its exhaust under a longer body with a different rear floor and load area than the sedan, so the mid-section sits and hangs differently. The M4938 is the centre silencer cut for that wagon routing — get the right one and it lines up to the wagon's hangers and clears the floor properly. It's built on a 2in body, matching the standard or lightly modified V6, and replaces the middle stage without disturbing the rest of the system.
What does the centre stage do here?
Sitting in the middle of the run, the M4938 absorbs and reflects sound inside its body to settle mid-range tone and the drone a six tends to send up through a wagon's larger rear cavity. It works the centre of the note rather than the tailpipe character at the back. There's no published sound figure, so the honest call is to hear a comparable wagon fit before deciding.
Will it suit my VS wagon?
It's listed to fit the Holden Commodore VS V6 wagon. The wagon mid-section is its own length and the hanger points differ from the sedan, which is exactly why this part is wagon-specific. Confirm your exact build with the workshop before ordering so you get the wagon box rather than a sedan unit.
How do we fit it in the Illawarra?
Oak Flats Muffler Men supplies and fits the M4938 in-house across the Illawarra. We hang it on the wagon's mid-section mounts, check clearance under the longer floor, and join it square to the pipe either side. Bring the wagon in and we'll confirm the fit and book the bay.
Stocked and fitted by Oak Flats Muffler Men, the Illawarra exhaust and 4x4 specialist in Oak Flats, NSW.
Common questions
Is the M4938 for the wagon specifically?
Yes — it's the VS V6 wagon centre muffler, routed for the longer wagon body rather than the sedan.
What bore is it?
It's built on a 2in body, suited to the standard or lightly modified VS six.
Can I use it on a VS sedan?
It's listed for the wagon. The sedan runs its own centre muffler, so confirm your body with the workshop first.
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.