Performance M
Dinan Performance Cat-Back Exhaust for BMW 340i F30 & 440i F32 (B58) - T304 Stainless, Twin 89mm Black Tips - Drone-Free Helmholtz - 340i/440i Sports Exhaust, Cat Back Rear Section, Back Box/Muffler Upgrade, Bolt-On OEM+ Sound
Dinan Performance Cat-Back Exhaust for BMW 340i F30 & 440i F32 (B58) - T304 Stainless, Twin 89mm Black Tips - Drone-Free Helmholtz - 340i/440i Sports Exhaust, Cat Back Rear Section, Back Box/Muffler Upgrade, Bolt-On OEM+ Sound
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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Dinan Sports Catback System for BMW F30 340i and F32 440i with B58
Give your B58-powered 3 Series or 4 Series the voice it deserves. This Dinan rear section system delivers a richer, deeper tone on throttle and a refined, drone-free cruise, thanks to carefully tuned Helmholtz resonator chambers. Crafted from 16 gauge T304 stainless for durability in all conditions, it is a premium upgrade that balances daily comfort with a properly sporty soundtrack.
- Tailored for the BMW F30 340i saloon and BMW F32 440i coupe with the B58 engine
- Flow-optimised tubing reduces restriction for sharper response
- Anti-drone Helmholtz chambers target low rpm frequencies for a calm cabin
- 100 percent 304 stainless construction for long-term corrosion resistance
- Direct bolt-on using factory hanger points for a clean, straightforward fit
- Twin 89 mm ceramic-coated black tailpipes for a stealth, OEM plus finish
- Confident, sporty character under load with civilised motorway manners
We run this system ourselves and our customers genuinely rate it. Expect a deeper note, crisp upshifts and tasteful burbles on lift-off without the annoying cabin boom that spoils many aftermarket options. Fitment is spot on, the quality is excellent and the look is understated yet purposeful.
Compatibility
- BMW F30 340i
- BMW F32 440i
- Engine: B58
Why this upgrade
If you are searching for a BMW 340i sports exhaust, a 440i catback, a B58 sound upgrade or an F30 F32 rear exhaust with black tips, this Dinan system ticks the boxes. It brings a richer soundtrack, premium materials and daily-driver refinement, all in a package that looks factory fresh.
Installation
Designed to mount to the original hanger locations for a tidy, hassle-free install. Prefer professional fitting? Book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
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