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Exhaust› Mufflers and Resonators
Flowmaster
40 Series Chambered Muffler 40 Series Stainless Steel 2.25 Offset In 2.25 Offset Out Aggressive Sound Flowmaster
SKU: F00L 8042443
Moderate — 2–4 hours
Overview
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Part #: 8042443
The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you.Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.Durable fully welded 409SS stainless steelAggressive Sound Exterior Exhaust ToneNoticeable interior resonanceExcellent Street/Strip and Off Road application
Features:
- Durable fully welded 409SS stainless steel
- Durable Fully Welded 409 Stainless Steel
- Aggressive Sound Exterior Exhaust Tone
- Aggressive Sound Exterior Exhaust Tone
- Noticeable interior resonance
- Noticeable Interior Resonance
- Excellent Street/Strip and Off Road application
- Excellent Street/Strip And Off Road Application
40 Series (TM) Muffler | 2.25 in. Offset Inlet/Opposite Side Offset Outlet | Case Dimensions 4 in. x 9.75 in. x 13 in. | 19 in. Overall Length | 409 Stainless Steel
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Flowmaster |
| Part Number | F00L 8042443 |
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! |
2020 Chevy Silverado Z71: Flowmaster 40 muffler
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Returns & Fitment
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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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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