
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.
View part
Silverado 2500 HD K2, 6.6L TD V8, 2017-2019, 4in-5in Turbo Back Without Cat & With Muffler.
Category: Mufflers and resonators


The muffler is what sets this one apart from the bare-pipe version: the MPI Automotive SSMKCH0035 is a 4in cat-delete turbo-back that keeps a rear muffler, listed to fit the Chevrolet Silverado 2500 HD 6.6L V8 turbo-diesel (2017–2019). It deletes the catalytic converter but retains a silencer, so it is the cat-delete build that still tries to keep the note civil.
Running cat-delete opens the system up, but it does not have to be raucous. The SSMKCH0035 keeps a rear muffler in the run, so a chambered silencer still does the job of absorbing and reflecting sound before the gas leaves the tailpipe. On a big 6.6L turbo-diesel that means a fuller note than stock without the full straight-through bark of a no-muffler build — the same cat-delete plumbing, but with the volume reined in at the back.
No — the SSMKCH0035 deletes the catalytic converter on a road-relevant turbo-back, so it is not ADR 79/04 compliant for road registration in NSW and is for off-road use only. Keeping the muffler controls the noise, but it does not restore the emissions equipment the truck needs to be registered on public roads here.
A turbo-back replaces everything from the turbo outlet rearward, the full engine-back section. The supplier lists this at a 4in bore, sized to the 2500 HD's 6.6L turbo-diesel V8 rather than a small motor. The muffler sits in that 4in run to silence the gas before it exits, which is the difference between this variant and the otherwise identical no-muffler version in the family.
Oak Flats Muffler Men supplies and fits this turbo-back in-house across the Illawarra. We confirm it against your 2017–2019 Silverado 2500 HD, check the 4in routing and muffler clearance, and book the bay once fitment is verified. It is a brought-in item; the listed recommended retail is $5,953.13, which we confirm with you along with availability before ordering.
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.