N45B20S 320si
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DualPlenum
A revolutionary advance in completely even airflow to all cylinders
Flanges & Fittings
Precision CNC machined flanges in aerospace grade 6082-T6 Aluminium or optionally Grade 5 Titanium.
Velocity Stacks
Raised Trumpets made from additively manufactured carbon fibre featuring an expansive umbrella form to improve cylinder draw and filling.
Carbon Runners
Tapered S-bend runners channel airflow into the cylinders with increasing velocity and minimal turbulence. Shorter runners improve the power at high rpm and offer a more exciting powerband.
The Quench
Using Bernoulli's Principle, The Quench is a highly optimised compression shape to quickly equalise air distribution from the first plenum into the second and accelerate the flow into each Trumpet.
First Plenum Stage
Featuring aggressive expansion from the throttle body, the incoming airflow pressure is raised before being rapidly dropped as air is quickly drawn into The Quench and second plenum.
18
Months of continual development & refinement.
From conceptual design, rigorous testing and development, DualPlenum has proven itself as the ultimate RWD intake shape, offering superior volume, distribution and flow characteristics.
25 Hours of Dyno Development
375 Hours of CFD Development
Superior Flow Distribution
to every cylinder
Standard Vs DualPlenum
Redline at wide-open throttle is where the most challenging conditions are met for an intake. This is where DualPlenum exhibits exceptionally even flow to cylinders 1-4, an achievement which is notoriously difficult on side feed airboxes like those found in RWD cars.
Before & After
DualPlenum fitting
Conditions simulated at 7000rpm - wide open throttle.
Traditional plenum with poor cylinder distribution
DualPlenum with even cylinder distribution
DualPlenum Advantages
The benefit of even air distribution:
With 4.25X more volume than the standard intake, larger raised velocity stacks and uninterrupted airflow access, the DualPlenum is the ultimate design for power and torque.
Because of even airflow to each cylinder, the ECU can more accurately control the fueling into the engine and therefore improve the power output and overall efficiency.
When the ECU detects stable conditions and minimal knock, it will gradually increase the ignition timing to improve the torque. With even cylinder filling, lean cylinders are eliminated which in turn prevents single-cylinder knock events.
With uninterrupted airflow into the velocity stacks, more laminar flow can be drawn resulting in better cylinder filling . Raised velocity stacks allow the engine to draw air from behind the stack itself, further improving the available airflow draw.
As pre-preg carbon fibre features extremely low temperature conductivity, minimal engine-bay heat is transferred into the intake charge, resulting in better power in heat soaked conditions.
Atelier
Stand out from the Crowd
Customise every aspect of your bespoke DualPlenum
Choose Your Trumpets
Choose between 3 different trumpets & peak-power ranges or select our Split Airbox Option to easily swap between different lengths for the ultimate road and track flexibility.
01
Road Trumpets - Stage 1
With a 6800-7300 RPM Peak Power band, the Road spec trumpets offer improved power and allow for a good compromise between everyday usability and a more thrilling top-end.
02
Sport Trumpets - Stage 2
Sport Trumpets offers an even more exciting driver experience for fast-road and track. With an RPM range of 7300 - 7700, this option is recommended for mapped cars, allowing more power to be produced with increased revs.
03
Race Trumpets - Stage 3
As the shortest and most aggressive Trumpets, Race offers improved umbrella geometry for a peak power range of 8000 - 8500 RPM and is only recommended for tuned engines using short-stroke or forged rods. Full performance Engine-building is also available.
01
Road Trumpets - Stage 1
With a 6800-7300 RPM Peak Power band, the Road spec trumpets offer improved power and allow for a good compromise between everyday usability and a more thrilling top-end.
02
Sport Trumpets - Stage 2
Sport Trumpets offers an even more exciting driver experience for fast-road and track. With an RPM range of 7300 - 7700, this option is recommended for mapped cars, allowing more power to be produced with increased revs.
03
Race Trumpets - Stage 3
As the shortest and most aggressive Trumpets, Race offers improved umbrella geometry for a peak power range of 8000 - 8500 RPM and is only recommended for tuned engines using short-stroke or forged rods. Full performance Engine-building is also available.
20 - 30BHP Increase
When Tuned
As Standard Specification
Compatible Models
BMW E90 320si
Engine Code
N45B20S
Throttlebody Size
64mm
Plenum Volume
8.5L (4.25X Displacement)
Carbon Tow
2x2 100% Pre-preg Carbon Fibre
Machined Flange & Fittings Material
Aluminium 6082 T6
PCV Compatabillity
Yes
Fuel Tank Vent Compatabillity
Yes
Compatible Without Mapping
Yes
Standard Injector Placement
Yes
Warranty
3 Years
Application
Natural Aspiration Only
BMW N45 (320si) Prepreg Carbon DualPlenum
Tax included. Shipping calculated at checkout
Free UK and European shipping and prepaid taxes and duties with no fees to pay on import
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Complete The Set
Compliment your DualPlenum for the ultimate in power & sound with our Carbon MAF tube & high-flow ITG Foam Filter.
BMW 4 Cylinder Carbon Intake MAF Tube
Sale priceFrom £275.00 GBP
BMW 4 Cylinder ITG Foam Filter Rubber Neck
Sale price£75.00 GBP
BMW 4 Cylinder Carbon Intake MAF Tube
Sale priceFrom £275.00 GBP
BMW 4 Cylinder ITG Foam Filter Rubber Neck
Sale price£75.00 GBP
Production lead time is currently 4-8 Weeks until dispatch
Production Timeline
Your bespoke carbon intake starts by choosing your completely unique specification from thousands of different option combinations.
CNC Flange Machining
All Flanges & Fittings whether titanium or anodised aluminium are machined entirely in-house on our state-of-the-art, large format CNC using the finest 2 micron tooling.
CNC Fitting Turning
Fittings such as the brake booster and fuel vapour are machined directly on a CNC Lathe.
Vapour Bead Blasting
Using the finest ceramic media for an even, high satin sheen, removing all machine marks and deviations.
Colour Anodising
Chemical Type II aluminium anodising in a wide range of colours and contrasts.
Trumpet Production
Your desired specification of trumpet length is additively produced using advanced Carbon Fibre 3D Printing. The plenum and trumpets are then adhered using ultra-high strength body adhesive.
Prepreg Carbon Lay-up
Production begins on the plenum body and runners where motorsport grade pre-preg carbon fibre is hand laid in-house into our own billet aluminium moulds. This is then pressure cured under extreme vacuum and temperature to form a high strength, lightweight structure.
Finishing
Once cured, the prepreg carbon is carefully hand finished with hours of fine sanding. Once levelled, the surface is professionally spray lacquered using several coats and then satin or tinting pigment is finalised in the last coat.
Shipping
Your unique plenum is serialised, recorded and carefully packaged with an update provided on the shipping timeline.
Have something even more Bespoke in mind?
Our Commission Team is always on hand for any kind of unique customisations or projects.