Exhaust› Mufflers and Resonators
Sinister Diesel
Sinister Diesel 4in. Inlet Universal Stainless Steel Muffler
SKU: S004 SD-U4M-01-20
Moderate — 2–4 hours
Description
Part #: SD-U4M-01-20
So your modified diesel truck is putting out the rich sound you want, except not where you want it: the cab. With the Sinister Diesel Stainless Steel Muffler, you can reduce the road drone in your cab, while maintaining that deep bellow from your exhaust kit.
4" Inlet Universal Stainless Steel Muffler .
MIA's Description
This muffler is built to last with its stainless steel construction and high-density packing.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Sinister Diesel |
| Part Number | S004 SD-U4M-01-20 |
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Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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