Exhaust› Mufflers and Resonators
Flowmaster
40 Series Chambered Muffler 40 Series 2.50 Dual In 3.00 Center Out Aggressive Sound Flowmaster
SKU: F00L 425403
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 425403 |
Videos
The ONLY Flowmaster Video you NEED to watch
Flowmaster 40 Series Delta Flow Mufflers Review - SEMA 2013
Flowmaster Super 40 Series Muffler Sound Test
How to Spot a Counterfeit Flowmaster Muffler
3" Flowmaster 40's vs Delta Flow 50's - Big Block Chevelle
Old Muffler Battle - FLOWMASTER Delta Vs. 40 Series Chambered - Who Sounds Better?
Flowmaster 40 Series Exhaust Install - 98 Chevy Silverado 1500
FlowMaster Original 40s vs. Super 40 Series on a Fox Body Mustang
I Installed A Flowmaster 40 Series Muffler On My Ford F150! | Sounds AMAZING! | NO WELDING NEEDED! |
2 Chamber Flowmaster Original 40 vs. Super 44 Muffler Sound Comparison
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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