Exterior Components› Body Panels and Components
Flowmaster
FLOWMONSTER 1-CHAMBER SMALL MUFFLER
SKU: F00L 42513-FM
Moderate — 2–4 hours
Description
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 | Flowmaster |
| Part Number | F00L 42513-FM |
Videos
The ONLY Flowmaster Video you NEED to watch
Flowmaster Muffler Chamber Comparison
How to Spot a Counterfeit Flowmaster Muffler
3" Flowmaster 40's vs Delta Flow 50's - Big Block Chevelle
Flowmaster Super 40 Series Muffler Sound Test
Flowmaster VS Borla VS Magnaflow Explained
2 Chamber Flowmaster Original 40 vs. Super 44 Muffler Sound Comparison
Tech Tip: Straight-Through Mufflers vs. Laminar Flow Mufflers
2004 Silverado 5.3L Flowmaster Super 44
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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