Performance M
Dinan Turbo Inlet Pipe - M240I/M340I/M440I/Z4 M40I GX
Dinan Turbo Inlet Pipe - M240I/M340I/M440I/Z4 M40I GX
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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Give your BMW B58 the breathing upgrade it deserves with this Dinan high flow compressor inlet tube for the M240i, M340i, M440i and Z4 M40i G‑series. This precision intake elbow replaces the restrictive factory plastic duct and frees up the intake tract for quicker spool, sharper throttle response and a stronger induction soundtrack. A premium carbon fibre construction, smooth internal geometry and direct OE style connections make this one of the most effective, must‑have airflow upgrades for your 3.0 straight‑six.
Perfect for enthusiasts chasing better drivability and a bit more drama from the turbo whistle and whoosh, this performance intake pipe delivers measurable flow gains without compromises. It is a simple, plug and play enhancement that pairs brilliantly with a stock airbox or an open intake.
Key gains and highlights
- Up to 14 percent increase in overall volume compared to the factory duct for improved airflow potential.
- Average 7.7 percent larger internal diameter along the tract for a de‑restricted, uniform path to the compressor.
- Silencer resonator removed for a fuller induction note, more audible spool and satisfying turbo noises.
- Smooth, optimised routing to reduce turbulence and encourage faster response under load.
- Lightweight carbon fibre body for strength, heat resistance and a premium under‑bonnet look.
- CNC machined fittings for precise alignment with factory hoses and hardware.
- Direct swap for the OEM plastic piece, no cutting or permanent modification required.
- Quick bolt‑on installation, ideal weekend upgrade with instant results.
Vehicle compatibility
Designed for BMW models equipped with the B58 3.0 petrol engine:
- 2 Series M240i G‑chassis
- 3 Series M340i G‑chassis
- 4 Series M440i G‑chassis
- Z4 M40i G‑chassis
Why enthusiasts choose this intake elbow
The stock intake tube features internal restrictions and a built‑in silencer that dampens sound and airflow. Dinan’s redesigned compressor inlet removes those bottlenecks and opens up the intake side so the turbo can draw air more efficiently. The result is crisper on‑road response and a more engaging induction character, especially under hard acceleration.
Real‑world confidence
We have installed this upgrade for customers and on our own builds, and the feedback is consistently positive. Expect a noticeable improvement in responsiveness and a richer induction note while maintaining OEM‑level fit and finish.
Professional fitting available
Want it installed properly first time. Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quick quote and availability.
Search terms you might know this by
BMW B58 intake elbow, high flow compressor inlet, induction pipe upgrade, pre‑turbo intake tube, intake duct for M240i M340i M440i Z4 M40i, G20 G22 G42 G29 intake upgrade, carbon fibre intake tube, resonator delete inlet, plug and play air intake pipe, performance intake for B58TU.
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