Mishimoto 2015+ Subaru STI Performance Cold-Air Intake System, Part 3: Testing

Interested in purchasing our 2015 STi intake system? Check out more details on our product page linked below!

Mishimoto Subaru STI Performance Air Intake

Dyno Testing

Time to see what kind of power gains we are able to achieve with our intake design! First, we strapped this Launch Edition to the dynamometer.

2015 STI on the dynamometer

2015 STI on the dyno

Then we began making pulls. On our first day we tested only the stock intake system. Once complete, we installed the Mishimoto intake system and sent the vehicle out for some road testing. We wanted to allow the ECU to adjust to the new intake before making our pulls. After well over 150 miles of road use, we returned the next day to compile dyno data for the Mishimoto intake.

2015 STI on the dyno

Testing Results

So how did we do? Well, I think the plots below summarize our results quite well.

2015 STI dyno plots

As you can see, our intake made a great impact on performance, especially at the upper end of the rpm range. The biggest gains occurred from around 5,000 rpm to redline. We saw peak power increases of nearly 20 whp and around 6 wtq. We also saw maximum gains of 22 whp and 17 wtq.

With our past intakes that make power on the stock tune, we have had a few inquiries regarding engine longevity, AFRs, and knock. Our AFR charts for the runs above are shown below.

2015 STI AFR plots

Although leaner than the stock curve, we are still well within a safe range for engine operation up through redline. Also, we experienced zero counts of knock during our dyno and road testing. These results were expected and are similar to those from our 2008–2014 intake system.

Intake Shroud Design

Now that we had positive testing results, we could move forward with producing our STI-specific shroud to get this product on the market! Check out a rendering of the design in 3D!

Mishimoto intake shroud render

Thank you very much for following along with the progress of our intake. This was quite an exciting project!

We are around 8 weeks from releasing this item. Would anyone be interested in a discounted presale offer for the members of the forum?

Let us know and we can set something up!

Thanks

Interested in purchasing our 2015 STi intake system? Check out more details on our product page linked below!

Mishimoto Subaru STI Performance Air Intake