# Dinan 15-18 BMW M3 Freeflow Axleback Exhaust System - Polished

Dinan's Free Flow axle-back exhaust system features 100% stainless steel construction measured to exact specifications to ensure proper fit via factory hangers and mounting points. Dyno tuned for maximum exhaust flow with minimum backpressure, this system is designed to provide a more aggressive sound under acceleration, while reducing drone inside the vehicle, thanks to computer-controlled valves that limit noise during low-speed driving and open fully during high-load conditions to allow free flow. The exhaust gasses exit through larger laser engraved polished, or ceramic black, quad tips.

-   Computer controlled valve limits noise during low speed driving; valve opens fully during high-load conditions to allow free flow
-   Twin secondary exhaust valves with a whopping 76mm diameter, making them 45% less restrictive than the OE valves.
-   Operation of exhaust valve is unchanged so exhaust tone can be adjusted via the M-Drive settings.
-   Quad 3.5" black ceramic coated, or polished stainless, laser engraved exhaust tips
-   Uses the factory brackets and hangers for a factory-like fitment
-   Drone abatement technologies used to reduce cabin resonance
-   Dinan exhaust is 3 lbs lighter than stock
-   Stock exhaust valve actuaters are reused
-   100% 304 stainless steel construction
-   Enjoyably louder, sporter sound
-   More Power: +5 HP

This Part Fits:

Year

Make

Model

Submodel

2015-2018

BMW

M3

Base

2015-2020

BMW

M4

Base

2019-2020

BMW

M4

CS

2016

BMW

M4

GTS

## Details

- **Price:** 1885.58 CAD
- **Vendor:** Dinan
- **Type:** Axle Back

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1885.58 CAD | In stock |

## Images

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

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/dinan-15-18-bmw-m3-freeflow-axleback-exhaust-system-polished)
> Updated: 2026-07-05