Design
One of the most challenging intake systems to design and manufacture to date and our showcase product.
Specifications
100% Pre-Preg Modular One-Piece Carbon Plenum with removable side inlet, lid and velocity stacks
Optional Side Inlets for fitment to MAF’s or larger Infinity Design Intake
Lower Air Filter Housings with integrated air feed fitting directly to oem air feeds
Bespoke large surface area Air Filters
Full Sealed Design allowing OEM levels of inlet air temperature
The BMW E60 M5 CSL has always captivated the hearts of S85 owners with the showcase being the single piece carbon plenum with larger side inlets running AlphaN software.
It was never available as a part to purchase.
We did not want to make just make another carbon plenum which replaces the OEM for noise alone.
Like the rest of our range we wanted to give the enthusiasts something very special for what is essentially one of the last of the truly great naturally aspirated engines.
Infinity Design therefore went the extra distance to give the enthusiast S85 owners something special.
The 100% pre preg carbon fibre plenum was designed in CAD software using accurate 3D scans of the engine bay without the OEM plenum in place, 3D scans of both of the individual OEM plenums and then combined together to make a singular larger volume system.
The induction sound is beyond what has been achieved by the market.
Mutiple reports of the intial pre production batch have shown more usable torque and improved 60-130mph times as well as improved power on dyno testing.
Under bonnet looks are sensational.
At the core of the design is the modularity. This is key both to the functionality, how the system is fitted, the multiple upgrade paths and also a lower price. No other product throughout the BMW aftermarket exists which is this complex and at the same time gives so many options and advantages.
There are 4 main components:
Main Plenum
Throttle body bosses
Velocity stacks
Side inlets
Lid
Fitment
The fundamental problem with one piece plenums is that they are very difficult to fit as the throttle bodies are at a 120 degrees angle to one another unlike the S65 engine where they are at a 180 degree angle and the plenum fits directly downwards on top of them. A solid one-piece plenum causes major issues when attempting to fit with the rubber boots not seating correctly onto the adaptors on the plenum which lead to major air leaks. The system also requires considerable force to seat correctly.
The Infinity Design plenum allows the throttle body bosses to first be attached to the rubber boots, the main plenum is placed onto the adapters, the velocity stacks are then attached, side inlets installed and lid installed leading to a leak free and simple process.
By keeping the main frame, throttle body bosses, velocity stacks, side inlets and lid separate a logical and simple process can be taken to fit the system giving no risk of overlapping of the throttle body boots which leads to air leaks and having to force the plenum into position
Upgradability
By allowing all of the parts to be separate it allows the end user to change the velocity stacks to shorter types to give a higher rpm biased power delivery.
The side inlets can be changed from the OEM style to the CSL Style which give a significantly larger opening leading to a large volume high flow intake system.
Resistance to Failure
It has been long known that carbon plenums suffer from internal failures. The most common issue is the velocity stacks break away as they are often glued. Over time the adhesive weakens with heat cycles and vibrations. Not only is the entire plenum wasted but can cause major catastrophic engine damage as the broken carbon shards entire into the combustion chamber.
The Infinity Design system has one piece velocity stacks which are bolted through the plenum into the throttle body bosses. There is no chance of failure.
Lower Cost
Since all of the parts of the plenum are individually manufactured and supplied there is no expense of assembly which poses a significant cost in carbon parts. Jigs are required for exact placement of parts with adhesive, drying times and cleaning required which all add time to the manufacturing process leading to a higher overall price.
Given how complex our system is, the cost is very reasonable.
The velocity stacks were lightly redesigned with a larger and longer opening with them all facing the significantly larger side openings rather than away from the path of the air.
Installation
AlphaN tuning required.
Plan 2-3 hours for installation.
Availability
Available Worldwide.
Dyno Testing
Dyno tests were performed under strict controlled conditions on a Dyno Dynamics machine in order to show a true and realistic result.
The first set of results show the best recorded stock run vs the best recorded run with the Infinity intake system and front air feeds.
15-25hp is gained through the rpm range with excellent gains below 3000rpm which can be attributed to the smooth elongated design of the intake tube which accelerates and smooths out the airflow. This gain is very much apparent under real world driving conditions under both partial and full load with a much smoother power delivery.
The next area where the expected majority of the improvements are seen are from 4750rpm to 7200rpm. The intake being free flowing and having a reducing cross sectional area improves airflow and therefore power where the oem intake becomes restrictive.
This is also translated under real world conditions with a harder surge to the red line.
Below is a further set of results showing the other dyno runs with the stock intake and Infinity intake.The F10 M5 is very sensitive on the dyno and can produce results which vary. Due to the S63TU engine being turbocharged, the charge temperatures can rise dramatically between runs. The engine management system will apply it’s compensation tables for increased charge, coolant and oil temperatures. Companies, their dealers and sponsors take advantage of this and show the lowest stock runs vs the highest runs with a modification fitted in order to exaggerate the gains for marketing and sales purposes.We are very much against showing these unrealistic gains as this is highly misleading.Below shows the results of multiple runs of the stock setup vs Infinity intakes fitted. If the lowest stock runs were used in our official results then a gain of approximately 35-40 hp could be shown which is not realistic of any intake system.
