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Dinan Free Flow Stainless Exhaust for BMW 440i 4 Series F33 Convertible & F36 Gran Coupe (2017-2018) – B58 Performance Axle-Back/Cat-Back Style Rear Silencer/Back Box – T304, Helmholtz Drone-Reducing, Black 89mm (3.5") Tips

Dinan Free Flow Stainless Exhaust for BMW 440i 4 Series F33 Convertible & F36 Gran Coupe (2017-2018) – B58 Performance Axle-Back/Cat-Back Style Rear Silencer/Back Box – T304, Helmholtz Drone-Reducing, Black 89mm (3.5") Tips

£1,567.28
£1,567.28
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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.

Dinan stainless performance rear section for BMW 440i F33 cabriolet and F36 Gran Coupé

Give your B58-powered 440i the tone, quality and road manners it deserves. This Dinan stainless performance system is tailored for the 2017 to 2018 BMW 4 Series F33 Convertible and F36 Gran Coupé, delivering a deeper, richer soundtrack with crisp crackles on overrun while staying calm and comfortable at motorway speeds.

Thanks to tuned resonator technology using a Helmholtz design, the cabin remains pleasantly quiet at steady cruise with no annoying boom. Open the throttle and the straight six sings with a refined, motorsport-inspired note that never sounds cheap or raspy. It is the ideal upgrade if you want a grown-up sports sound with daily-drive civility.

Key reasons drivers choose this upgrade

  • Enhanced flow path that supports tuning potential and sharper throttle response
  • Rich, bassy tone at idle that builds to an aggressive yet tasteful roar under load
  • Drone control via Helmholtz resonator for relaxed long-distance cruising
  • 304-grade 16 gauge stainless construction for excellent longevity and corrosion resistance
  • Twin 89 mm 3.5 inch black ceramic-coated tailpipe finishers for a stealth, OEM plus appearance
  • Direct bolt-on fit using factory mounting points for neat alignment and straightforward installation

Our workshop notes

We have fitted this Dinan system on multiple customer 440i cars and the feedback has been consistently positive. Owners love the premium tone, the lack of cabin drone and the spot-on tip alignment. It looks factory fresh, sounds properly engineered and elevates the driving experience without compromise.

Compatibility

  • BMW 440i F33 Convertible - 2017 to 2018
  • BMW 440i F36 Gran Coupé - 2017 to 2018

Professional fitting

Want it installed perfectly first time? Book expert fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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