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  1. A Front-Mount for the 2015 STi, Part 4: Final Prototype Fitting

    A Front-Mount for the 2015 STi, Part 4: Final Prototype Fitting

    Putting together our final prototype was a bit easier for this project compared to other front-mount intercooler (FMIC) kits our team has developed. As mentioned in previous segments, we used the crash beam and intercooler from our 2015 WRX kit. Now we've worked up some functional prototype piping for a final test fit.

    First, let's take a quick look at each portion of the kit.

    Intercooler and Crash Beam

    The intercooler core is the key component in any intercooler kit. This core has provided significant air temperature drops during our testing on the WRX, and we expect the same results with the STi.

    Mishimoto STi intercooler and crash beam
    Mishimoto STi intercooler and crash beam

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  2. A Front-Mount for the 2015 STI, Part 3: Hot-Side Intercooler Pipe Fabrication

    A Front-Mount for the 2015 STI, Part 3: Hot-Side Intercooler Pipe Fabrication

    With our cold-side piping complete, it was time to focus on the hot side. This portion of the piping system would require a bit more attention, mainly because we were unable to scavenge any existing pipes from our WRX/STI front-mount intercooler kits (as we did with the cold side). Let's get to it!

    Piping Fabrication

    The hot-side piping will route from the turbocharger compressor outlet, around the driver side of the engine bay, and into the front bumper area to attach to the intercooler.

    Here is a look at the turbocharger connection point.

    2015 STi front-mount intercooler hot-side pipe turbo connection
    2015 STi front-mount intercooler hot-side pipe turbo connection

    A coupler attaches the pipe to the turbocharger.

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  3. A Front-Mount for the 2015 STI, Part 2: Cold-Side Intercooler Pipe Fabrication

    A Front-Mount for the 2015 STI, Part 2: Cold-Side Intercooler Pipe Fabrication

    Our first segment of this STI intercooler project involved the test fitting of our WRX crash beam and intercooler core. We were able to verify fitment of both pieces, which allowed our team to move on to piping fabrication. We are starting this kit with the cold-side pipe, which we've decided to place this on the passenger side of the engine bay to reduce the piping length as much as possible. Following this strategy should help reduce lag seen by the driver.

    Pipe Fabrication

    The cold-side pipe is a great place to start because we are able to use a portion of one of our existing kits. Because the 2015 model shares the EJ from the 2008+, we will be reusing the pipe that attaches to the throttle body and incorporates the BPV (bypass valve).

    2015 STI front-mount</body> " width="300" height="180">
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  4. 2008+ Subaru WRX/STI Aluminum Coolant Overflow Tank R&D Update!

    2008+ Subaru WRX/STI Aluminum Coolant Overflow Tank R&D Update!

    Interested in picking up our 2008-2014 WRX/STi overflow tank? Check out our discounted pre-sale linked below.

    2008-2014 Subaru WRX aluminum overflow tank pre-sale!

    We last left you with some details of our initial design and a hint of an upcoming pre-sale for this overflow tank. Unfortunately, since that initial test fit we hit a few snags in the design process. Our goal with this product is to provide compatible fitment with all our other 2008+ WRX and STi components. This required numerous stages of test fitting, one of which revealed an issue. With our larger 3-row X-Line aluminum radiator installed, our sight tube on this expansion tank design ended up too close to the belt drive system on our Subaru.

    We decided a revision was necessary. Although the two components were not physically touching, the clearances were just too tight for our comfort. Luckily, our team had an

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  5. Dropping Intake Temps. 2015 STI FMIC R&D, Part 1: Core Fitment and Piping Plans

    Dropping Intake Temps. 2015 STI FMIC R&D, Part 1: Core Fitment and Piping Plans

    We've given the 2015 WRX quite a bit of love, mostly due to the introduction of the FA20DIT within the new chassis. Our team developed a ton of awesome components: a downpipe, an intake system, a couple different intercooler options, and various other neat parts. With our WRX projects mostly wrapped up, it's time to turn our attention towards the STi. It still has an EJ engine under the hood, but it is mated to a new chassis that many are taking advantage of in various forms of competitive racing.

    So far we have developed an intake and a cat-back exhaust for the STI. Our next target is a bolt-on front-mount intercooler (FMIC) kit for the 2015 STI. The EJ25 is a well-respected engine that can make great power from basic bolt-ons and tuning. In addition, the sky is the limit in terms of power output once engine internals are upgraded and a large snail is bolted up. Greater power means more heat, resulting in the need for a more efficient heat exchanger for the charge-air system. Thus,

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  6. 2008+ Subaru WRX/STI Aluminum Coolant Overflow Tank R&D!

    2008+ Subaru WRX/STI Aluminum Coolant Overflow Tank R&D!

    Interested in picking up our 2008-2014 WRX/STi overflow tank? Check out our discounted pre-sale linked below.

    2008-2014 Subaru WRX aluminum overflow tank pre-sale!

    If you haven't noticed, the folks here at Mishimoto are not fans of plastic use for cooling system components. A large number of our products provide a more durable material, aluminum, to replace the failure-prone plastic parts, and now we are focusing on another line of products, our aluminum coolant expansion tanks. We offer two different options for the WRX/STI and one for the new Mustang EcoBoost. This article is focused around our newest addition, an aluminum overflow tank for the 2008+ WRX and STI.

    Product Design

    We won't be making any significant changes to the design of this tank compared to the stock unit, except for the construction material. Enlarging the tank's capacity will

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  7. A New WRX/STI Catch Can System, Part 2: WRX Test Fitting

    A New WRX/STI Catch Can System, Part 2: WRX Test Fitting

    Interested in purchasing our WRX or STi catch can system? Check out more details on our product pages linked below!

    Subaru WRX Baffled Oil Catch Can System

    Subaru STi Baffled Oil Catch Can System

    After completing the fabrication of our brackets for this kit and assembling the STI-specific lines, it was time to tackle the WRX. As you may be aware, the stock CCV lines are slightly different on the WRX, which necessitates a separate set of WRX-specific catch can lines.

    The Test Subject

    After reaching out to local contacts, we found a willing vehicle donor just one state away. We have borrowed this particular vehicle on several occasions for a variety of test fittings. A big "thank you" to the owner for lending his vehicle and his time for the sake of awesome new product development!

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  8. Mishimoto 2015+ Subaru STi Performance Cold-Air Intake System, Part 4: Race Intake System

    Mishimoto 2015+ Subaru STi Performance Cold-Air Intake System, Part 4: Race Intake System

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

    Mishimoto Subaru STI Performance Air Intake

    As noted earlier in this article series, we would be tackling a race intake system to go along with our bolt-on unit. So what makes the race system different? For this particular system we are using a larger-diameter intake pipe with a larger MAF housing. This means greater intake flow, but it also means it will no longer function with the factory tune. This system is meant specifically for drivers who want aggressive professional tunes so they can take advantage of airflow modifications such as larger turbochargers and high boost pressures.

    Because the 15' model shares the EJ from the previous generation, we would be using the same intake pipe and filter as we did with our 2008-2014 kit. This unit is shown below.

    So, all we truly needed

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  9. A new WRX/STI Catch Can System, Part 1: Initial Fabrication

    A new WRX/STI Catch Can System, Part 1: Initial Fabrication

    Interested in purchasing our WRX or STi catch can system? Check out more details on our product pages linked below!

    Subaru WRX Baffled Oil Catch Can System

    Subaru STi Baffled Oil Catch Can System

    Mishimoto 2010 STI
    Mishimoto 2010 STI

    After developing a highly successful, direct-fit catch can setup for the 2015 WRX we turned our attention to the previous generation. Our next target would be the 2008-2014 WRX and STI. At this point, Mishimoto still owned a 2010 STI, and this project would be our last for our shop vehicle.

    Catch Can Selection

    As with our 2015 WRX

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

    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 dynamometer

    2015 STI on the dyno
    2015 STI on the dyno

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