Universal 4" Optimal Flow Muffler
Universal 4" Optimal Flow Muffler is backordered and will ship as soon as it is back in stock.
Shipping & delivery
Usually ships in 2–3 business days unless a different lead time is shown on this page. Shipping cost is calculated at checkout (UPS or USPS to the contiguous U.S.).
Shipping policy · Returns · Fitment questions? (561) 207-7988
Delivery and Shipping
Delivery and Shipping
Standard order processing is 2–3 business days unless this product or your order confirmation states a different lead time. Custom-built, made-to-order, backorder, and pre-order items follow their stated lead times.
Enclosures and subwoofer boxes ship for $50 per unit. Other shipping charges are calculated at checkout. Orders outside the contiguous 48 United States may require additional shipping; we will contact you for approval before shipment.
Subwoofer boxes ship UPS Ground where available. Read our Shipping Policy and Return and Refund Policy for delivery, product-specific return windows, and warranty details.
Universal 4" Optimal Flow Muffler
Universal 4" Optimal Flow Muffler is backordered and will ship as soon as it is back in stock.
Description
Description
| Feature | 4 Inch | |
| Material |
T409 Unpolished Stainless Steel |
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Vehicle Fitment
Our mufflers fit all Powerstroke, Cummins and Duramax models available on our website. This will fit any 4" aftermarket straight pipe exhaust system.
Installation
You will have to measure and cut your current exhaust for this to fit. We recommend welding the muffler in place. However, you can also clamp them on. Clamps are NOT included.
Product Features
- Straight-through flow path for maximum performance
- Non-directional design, allowing you to install the muffler in however way suites your truck and exhaust system best.
- Stainless steel construction for lifelong protection (unpolished)
- Internal stainless steel mesh & fiberglass construction to withstand harsh conditions and advanced technology to absorb unwanted interior resonance.
- Straight-through design to reduce back pressure and enhance performance
* Note: Alaska, Hawaii and some Canadian locations will be subject to additional freight charges
Fitment & installation
Fitment & installation
Check the selected part against your vehicle. Need help? Call (561) 207-7988.
Selected part: DW-4MUF-ALL-0001
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Read FOX’s application notes for part 987-24-001 (rear shock)
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
