As part of our expanding Toyota product range, AIRTEC Motorsport is proud to launch our inlet manifold upgrade aimed at modified Yaris GR owners who want to further improve the performance of their cars for track or fast road use.

The Design
We wanted to develop a manifold with an improved design to allow more flow, whilst introducing longer inlet runners to help produce more power at lower engine speed. We also wanted to incorporate a design that increased air flow balance across the three cylinders. Crucially, we were also determined to create a true direct replacement manifold that required no further modifications, such as custom fabrication or a costly aftermarket ECU. After a thorough development process that saw us simulate and test several different designs, the result is a manifold unlike any other on the market.

Tested – Increased and Balanced Flow
Our freer-flowing design measured an improvement in flow of 36% in comparison to the original. Furthermore, by flow testing the original manifold and using runner number two as the benchmark, our test data revealed runner number one flowed a 13% difference on average whilst runner number three flowed an 11% difference on average.  
In direct comparison, the same test conducted on our AIRTEC Motorsport manifold revealed a difference of just 2% on runner number one and only 4% on runner number three, therefore providing much more equal balance across the cylinders, which is crucial for safe and efficient fuelling as well as consistent power and torque. 

Direct Replacement Fit 
We also completed our secondary goal of ensuring the manifold was a true direct replacement by utilising the original throttle body and pipework. The manifold also includes moulded fixing tabs to secure the coolant lines and wiring loom, which secure in place as per the original. Lastly, the manifold allows the original rubber gaskets to transfer over for a simple and easy installation process. If you have an AIRTEC Motorsport catch can fitted, please choose from the drop down menu, as the breather fittings require different take offs. 
Please note: the manifold has been designed to also allow a larger 54mm throttle body to fit if preferred, but this will require additional works to the boost pipework and ECU. 

Construction 
Made from high-quality cast aluminium for increased strength over the original plastic assembly, the manifold is finished in high-quality powder-coated black for a neat OEM+ look to improve the appearance of the engine bay. The comprehensive fitting kit includes two replacement Pro Hoses silicone, all fixtures and fittings as well as detailed installation instructions. 
Please note: the original engine cover will need trimming to fit or you can fit the AIRTEC Motorsport replacement engine cover. 

In summary, our manifold is unique, offering unparalleled benefits, proven gains and easy installation, and all at a great value cost. 

Dyno Tested
The manifold was tested on our own demonstration Yaris GR fitted with a big turbo conversion, Syvecs ECU and all associated modifications. With no changes (no mapping or increased boost) a back-to-back test revealed the fitment of the manifold alone saw power increase from 405.2bhp to 415.0bhp – an increase of nearly 10bhp with no other modifications. Response also appeared to increase lower in the rev range and with mapping to suit, further increases would likely to be seen. 

Features: 

• 36% increase in internal flow compared to original manifold 
• Improved engine performance and throttle response
• Dyno testing showed increases to both power and torque
• Proven to distribute flow more evenly across all three cylinders
• True direct replacement fit that requires no additional parts
• No ECU/throttle body upgrade or pipework required
• Will also work with larger 54mm throttle body, if preferred
• Provisions to secure original coolant lines and wiring loom
• Cast aluminium construction for improved strength 
• Finished in a high-quality black powder coat
• Includes all fixtures and fittings required to fit
• Detailed installation instructions included