
Silverado 2500 HD T1, 6.6L TD V8, 2020-2025, 4in-5in Turbo Back With Cat
MPI AutomotiveRRP$7103.73Silverado 2500 HD T1, 6.6L TD V8, 2020-2025, 4in-5in Turbo Back With Cat & Muffler (SKU: SSMKCH0024) Engineered.
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Silverado 2500 HD T1, 6.6L TD V8, 2020-2025, 4in-5in DPF Back Without Muffler (SKU: SSMKCH0028) Engineered.
Category: Mufflers and resonators


A stepped 4in-to-5in bore and a muffler-delete are what define the MPI Automotive SSMKCH0028 — a DPF-back section listed to fit the Chevrolet Silverado 2500 HD T1 6.6L turbo-diesel V8 (2020–2025). It starts behind the diesel particulate filter and runs muffler-free for an open note.
A DPF-back replaces the exhaust from behind the diesel particulate filter rearward, leaving the DPF and the emissions hardware upstream untouched. On the Silverado's 6.6L turbo-diesel V8 the SSMKCH0028 runs a stepped 4in-into-5in bore and deletes the rear muffler, so it opens the note without disturbing the particulate filter.
Stepping the pipe from 4in up to 5in toward the rear gives a larger exit while keeping a tidy 4in run off the DPF-back connection. Paired with the muffler delete, that makes for a free-flowing, vocal section. The bore figures here are the system's own — it's sized for the big diesel V8.
As a DPF-back, the SSMKCH0028 leaves the diesel particulate filter and the upstream emissions equipment in place — it doesn't touch the DPF. Deleting the muffler does change the note, so confirm noise levels and any state requirements with the workshop before fitting.
Oak Flats Muffler Men supplies and fits this MPI Automotive DPF-back section in-house across the Illawarra. We confirm the connection behind the DPF, check hanger points on the stepped 4in-5in run and the listed Silverado fitment, then book the bay. The RRP is $2,941.84.
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.