Performance M
Dinan Free Flow Axle-Back Exhaust for BMW 440i F33/F36 (2017–2018) – Stainless Steel Sports Rear Silencer/Back Box with Twin 89mm Polished Tips – No-Drone Helmholtz Performance Muffler for 4 Series B58 Gran Coupe & Convertible – Direct Bolt-On Fit
Dinan Free Flow Axle-Back Exhaust for BMW 440i F33/F36 (2017–2018) – Stainless Steel Sports Rear Silencer/Back Box with Twin 89mm Polished Tips – No-Drone Helmholtz Performance Muffler for 4 Series B58 Gran Coupe & Convertible – Direct Bolt-On Fit
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Unlock the soundtrack your BMW 440i deserves
Transform the character of your B58-powered 4 Series with this Dinan performance rear section. Engineered for the F33 cabriolet and F36 Gran Coupe, it delivers a deeper, richer tone on every drive while remaining calm and composed at cruising speeds. Under throttle it comes alive with a purposeful note and tasteful crackles on overrun, giving you that OEM-plus feel enthusiasts want.
Designed with a Helmholtz resonator to cancel low‑rpm boom, this system keeps the cabin free from unwanted drone. The low‑restriction layout optimises gas velocity for improved response, while precision construction ensures a direct, hassle‑free installation on factory mounting points.
Why choose this upgrade
- BMW 440i exhaust upgrade for F33 and F36 that enhances tone without drone
- Low‑restriction design for sharper throttle response and freer breathing
- Helmholtz resonator for refined motorway manners and everyday comfort
- Dual 89 mm mirror‑polished tailpipes for a clean, motorsport‑inspired finish
- 16‑gauge 304‑grade stainless steel throughout for long‑term corrosion resistance
- Direct bolt‑on fitment using OE hangers and rubbers
- Developed by Dinan for a true OEM‑plus upgrade to your 4 Series
Fitment
Compatible with:
- 2017–2018 BMW 440i F33 Convertible
- 2017–2018 BMW 440i F36 Gran Coupe
Materials and construction
Built from 16‑gauge 304 stainless steel with precision welding and high‑quality finishes, this performance rear silencer resists corrosion year after year. The twin 89 mm polished outlets complete the premium look at the rear.
What owners say
We have installed this system in‑house at MJ Modifications and customer feedback has been consistently positive. Clients love the refined cruising manners and the confident, sporty note when pressing on.
SEO‑friendly highlights
BMW 4 Series 440i exhaust upgrade UK. BMW F33 exhaust system. BMW F36 Gran Coupe sports exhaust. B58 performance muffler. Rear silencer replacement. Stainless steel performance system. No‑drone highway sound. Bolt‑on tailpipe upgrade. Mirror‑polished tips. OEM‑plus sound for daily driving and spirited runs.
Professional installation
Want it fitted by experts? Book installation with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.
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