Page 6 - exhaust

Interested in purchasing our 2015 WRX cat-back exhaust? Check out more details on our product page linked below!

Subaru WRX/STi Cat-Back Exhaust

Prototype Fabrication

With the front section of our exhaust complete, we needed to address the Y-section as well as the pipes routing to the mufflers. We decided to go with 2 1/4" piping following the Y-section, which matches the diameter of the STi system.

Check out a couple shots from the fabrication process.

Fabricated muffler section

We bent a few more hangers for attaching the mufflers to the appropriate stock locations.

Interested in picking up this exhaust adapter? Check out more details on our product page!

Mishimoto Subaru Exhaust Adapter, 3" Downpipe To Stock Exhaust

Looking for a better way to mate your 3" downpipe to the stock cat-back exhaust? Sick of blowing out gaskets and smearing copper sealant all over your flanges? Mishimoto now offers a 100% stainless steel downpipe adapter flange specifically for mating to a stock exhaust system. If you have a 2002+ WRX or STi, this is the piece for you! Check it out.

The flange adapter itself!

Interested in purchasing this Duramax Intercooler? Check out our product page for more information!

Mishimoto Chevrolet/GMC 6.6L Duramax Intercooler Kit

With our testing complete, it was time to recap the results and see what kind of benefits our cooler was capable of producing. The testing procedures and information from our previous posts are outlined below.

Testing Procedures and Information

Vehicle: 2011 Chevrolet 2500 6.6L LML Duramax

Engine Modifications: None, all factory equipped

Ambient Temperature: 85°F (29.5°C)

Humidity: 35%

Sensors: PLX Pressure and temperature sensors were placed on both the hot-side and cold-side intercooler boots.

Physical Benefits

Before we jump right into the testing data, let's compare the physical aspects of our intercooler design that distinguish our unit from the factory cooler.

Interested in purchasing this Duramax Intercooler? Check out our product page for more information!

Mishimoto Chevrolet/GMC 6.6L Duramax Intercooler Kit

Product Testing and Procedures

The fun part of development is the reveal of our initial prototype design, but the truly exciting part is the testing portion of development. At this point our offices are disrupted by noise from the dyno pulls, tempting a few of our empolyees to filter into the garage and check out the action. Below we see the truck loaded onto the dyno.

LML test truck on dyno

Interested in purchasing this Duramax Intercooler? Check out our product page for more information!

Mishimoto Chevrolet/GMC 6.6L Duramax Intercooler Kit

Prototype Test Fitting

Time to see if this massive intercooler fits! Our prototype design was based on critical dimensions taken from a test vehicle so we could expand the cooler as much as possible without causing fitment concerns. Let's see if we succeeded on our first attempt!

The radiator and intercooler are thicker than the factory units, so we bolted the intercooler prototype to the new Mishimoto radiator prototype. Now attached to each other, we installed them together for the benefit of those customers who would want to purchase both components.

Interested in purchasing this Duramax Intercooler? Check out our product page for more information!

Mishimoto Chevrolet/GMC 6.6L Duramax Intercooler Kit

Prototype 3D Design

Now that we outlined our project goals and had all the test data from the factory intercooler, our engineers were ready to design a prototype intercooler. Using dimensional data from a rendering of the truck as well as the actual measurements we took from the test vehicle and factory intercooler, our team was able to create a very nice looking prototype. Check out a couple renderings of the design!

Mishimoto prototype intercooler rendering

Interested in purchasing this Duramax Intercooler? Check out the product page for more information!: Intercooler Kit, fits Chevrolet/GMC 6.6L Duramax 2011-2016

Welcome back! In our last segment we removed the factory intercooler so we could determine if this project would even be necessary. The good news is, all that work was not for nothing; our team found several aspects of the factory intercooler that could be improved. Check out a few more detailed images of the factory intercooler.

First, a peek at that interesting metal end tank we discussed in part 1 of this article.

Factory LML intercooler metal hot-side end tank

Interested in purchasing this Duramax Intercooler? Check out our product page for more information!

Mishimoto Chevrolet/GMC 6.6L Duramax Intercooler Kit

Product Introduction

The LML Duramax is the cleanest and most powerful Duramax thus far. The innovations made for this new model are quite substantial and are a direct result of serious advances in automotive technology. Unfortunately, stricter emissions standards of today result in the inclusion of a DPF (diesel particulate filter) system, which improves emissions yet hampers fuel mileage.

Luckily, not all the innovations for newer Durmax models are in place to provide cleaner air; several features of the new engine are in place for improved performance and reliability. Among the long list of improvements, a few highlights include a quick-spooling VGT turbocharger, a factory-equipped exhaust brake, upgraded designs of the main