2015+ (VA)

"You know cars, right?" I'm sure that's a question that all of us gearheads have been asked before. It's typically the wind up for a pitch to help them find the car that's going to suit every one of their specific needs, which usually looks something like a combination of reliable, fun, and gets good gas mileage. Oh yeah and it snows like once a year so all-wheel-drive is a must. Their budget is around $30k. I know what you're thinking, a 2013 BMW 328i xDrive hits the nail on the head, but I know most of us would point this friend to the obvious choice"the WRX.

Since 1992, the Subaru has made a name for itself by mixing these characteristics into the affordable WRX. Granted, we didn't see this trim until 2000, but it's no surprise why it immediately took off and became a staple in the enthusiast community. The trademark growl that came with the turbo-boxer engine powering all four wheels was enough to make anyone feel like they were driving a world class rally car.

When it comes to the

Life is all about balance. It may be cliché, but it's true, especially when modifying cars. Attention must be paid to balancing power with handling, air with fuel, and most importantly, parts on your car with money in your wallet. That same balancing act applies to our catch can kits. We spend a lot of time balancing the cost of a catch can kit with its benefits.

Our 2016+ Camaro 2.0T catch can kit utilizes two cans to capture the maximum amount of blowby.

Many engines have a "clean" side of the crankcase ventilation system and a "dirty" side. Some engines produce just as much worrisome blow-by from their clean side as their dirty side. We usually develop a two-can kit for these engines, one for each side of the system. Other engines' clean sides don't really produce much blow-by, so adding another can would drive up cost with no benefit to the customer.

Then, there are the engines whose clean-side blow-by production is borderline. Their clean side may not produce much blow-by, depending

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

This core was engineered to provide an ideal balance between heat transfer and airflow.

Silicone Components

Mishimoto 2015 STi front-mount intercooler silicone hoses

Kit Accessories

A few brackets and some hardware help piece this kit together for a solid, durable installation. We are also including a BPV (bypass

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

A coupler attaches the pipe to the turbocharger.

The end of this pipe must attach to our intercooler, which is mounted within the front bumper area. This requires snaking the piping through the engine bay and locating an ideal spot for the piping to travel outside of the engine compartment.

2015 STi Intercooler pipe connection

We should have no issues routing our pipe between the washer

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 intercooler development

This pipe provides optimal clearance through its path within the engine bay. It routes from the throttle body into the portion of the engine bay that previously contained the intake airbox.

2015 STI front-mount

We're back with another quick update on our TGV delete project for the 2015+ WRX. After designing our initial models and then 3D-printing a prototype for test fitting, we worked up a couple functional prototypes for on-car testing.

First Prototype Images

Check out a few images of our functional prototype deletes!

Mishimoto's 2015 WRX TGV delete prototypes

Mishimoto's 2015 WRX TGV delete prototypes

As you can see, we have two different prototypes. Although the shape and design are the same, these prototypes are composed of different materials. The polished unit is a CNC-machined aluminum piece. The black prototype is machined from Delrin, a thermoplastic material.

We want to explore any differences in intake temperatures provided by the alternate materials. As you can imagine, thermoplastic has very low thermal conduction properties, meaning it is less likely to heat-soak and is more resistant to heat transfer. That said, the surface area that actually comes into contact with the internal

3D-Printed Prototypes

To confirm the dimensions and design of our prototype, we decided to utilize some of our rapid prototyping tools. We fired up our 3D printer and loaded the model. Check out a couple images showing the progress of the print.

3D-printing 2015 WRX parts

3D-printing 2015 WRX parts

Once the printing process was complete, we cleaned up the prototypes and installed them on our 2015 WRX to verify fitment.

3D-printed 2015 WRX parts

3D-printed 2015 WRX TGV delete installed

You will notice these prototypes include a rear flange to attach to the TGV solenoid. We experimented with a design that retains the flange, in order to bolt the stock solenoids in place for visual inspection purposes. After evaluating this setup, we decided the flange was unnecessary and removed it from the design. Our two functional prototypes will be more similar to our original 3D models.

Coming up - Functional Prototypes

With fitment confirmed, we began working up a couple functional prototypes for product