# Dinan 11-16 BMW 550i xDrive Freeflow Axleback Exhaust System - Polished

Dinan's Free Flow Axle-Back Exhaust improves exhaust flow by reducing back pressure, resulting in increased power output and a great sporty sound that is civilized when you want it to be and pleasantly aggressive under harder acceleration with zero drone. 100% stainless steel construction and exacting specifications ensure that the system fits correctly using the factory hangers and will resist corrosion for years to come. A vacuum controlled butterfly valve is utilized to improve flow at wide-open throttle while keeping things civilized and "drone" free throughout. The design reduces overall weight as well and features 3.5'' polished, or ceramic black, tips for a tasteful high-performance look.

-   Quad 3.5" laser engraved, polished or ceramic black exhaust tips
-   Uses the factory brackets and hangers for a factory-like fitment
-   Drone abatement technologies used to reduce cabin resonance
-   More Power: + 10 HP when coupled with engine software
-   100% 304 stainless steel construction
-   Enjoyably louder, sportier sound

This Part Fits:

Year

Make

Model

Submodel

2011-2016

BMW

550i

Base

2011-2016

BMW

550i xDrive

Base

## Details

- **Price:** 3393.67 CAD
- **Vendor:** Dinan
- **Type:** Axle Back

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3393.67 CAD | In stock |

## Images

- Photo - Primary
- Photo - out of package
- Photo - out of package

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/dinan-11-16-bmw-550i-xdrive-freeflow-axleback-exhaust-system-polished)
> Updated: 2026-07-05