★★★★★ 5
Amazing fit and price
Works great every time!
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Reviewed in the United States on September 10, 2025
MagnaFlow Muffler Mag SS 11X4X9 2.5 D/D
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
MagnaFlow Muffler Mag SS 11X4X9 2.5 D/DThe MagnaFlow 4" X 9" Oval Straight Through 11379 is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dyno proven performance thanks to its free flowing straight through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill. The reversible, universal 2. 5 2. 5in. diameter inlet outlet Straight Through layout allows you to install it in whatever orientation and configuration you
Quick Dispatch:
Your MagnaFlow Muffler Mag SS 11X4X9 2.5 D/D orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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You'll receive a tracking link by email once your MagnaFlow Muffler Mag SS 11X4X9 2.5 D/D ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.8 ★★★★★
Based on 2071 reviews
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Product Reviews
★★★★★ 5
Great replacement filters
I’m onto round 2, almost due for round three of filter and oil changes on my eco diesel JL and so far these have worked great because i refuse to pay $50 for just an oil filter. No oil pressure issues with the oil filters and fuel filters prime and work as they should.
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Reviewed in the United States on March 2, 2025
★★★★★ 5
Perfect fit for 2020 jeep eco diesel
Send set 8 have used, on my 2020 Jeep Wrangler Rubicon with Eco Diesel.
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Reviewed in the United States on May 15, 2026
★★★★★ 5
On time shipping
What I need when I need it
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Reviewed in the United States on May 7, 2026
★★★★★ 1
Oil pressure drop
Once the engine warms up, the oil pressure drops enough to trigger the check engine light every time it dips below the threshold. I decided to try an aftermarket oil filter, but it looks like I’ll be switching back to the pricey OEM one after all.
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Reviewed in the United States on December 14, 2025
