2008+ Subaru WRX/STI Performance Air Intake Part 4: Final Design Testing and Data
Interested in purchasing our WRX/STi intake? Check out more details on our product page linked below!
Subaru WRX/STi Performance Cold-Air Intake
It was now time to see the fruits of our labor and collect some data with our revised design. Our poor STI was once again strapped to the dyno (This is what it’s built for, right?) and endured pull after pull as we evaluated power, AFRs, sound improvements, and durability. Weeks of testing resulted in a design that not only pleased our engineers, but also excited them to see some enthusiasts install and use it. Bolting on 25 whp has never been easier, and this intake shows gains through the entire power band.
Everyone loves dyno videos!
And … the results are in! As shown below in Figure 1, our air intake makes substantially more power over the factory intake throughout the entire power band, especially in boost. Also shown are the AFRs of both the OEM and Mishimoto intakes. Although leaner than the OEM unit, the Mishimoto air intake is well within the safe range and will not compromise reliability.
Air filter construction and size is another key component that helps this kit provide these exceptional gains. As shown in Figure 2, the Mishimoto high-flow air filter provides increased flow and a 16% increase in surface area compared to the OEM paper filter. Not only this, but Mishimoto air filters will provide a lifetime of service. For this kit we selected an oiled filter that can be cleaned and serviced easily to provide consistent performance for your flat four.
We will be performing sound tests soon! Check back for more information.