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The Moditorium

A high performance automotive resource for parts, how-to's, projects, buyer's guides, technical, events, and more.

How to Plan a 2015-2021 WRX Build

Subaru WRX / WRX STI

How to Plan a 2015-2021 WRX Build

By: Alan Jackson / November 20th, 2023

You simply cannot plan your WRX build the same way you could up through model years 2014 for the WRX and 2021 for the STI. The car is fundamentally different than previous generations. The FA20DIT powered WRX is a massive overhaul from what Subaru owners and enthusiasts were used to prior to it's 2015 model year release. On paper, it seems similar - turbocharged, boxer engine, all-wheel-drive, sedan. After that it gets blurry. Aside from a new body design, the engine is now direct injected and features a completely different turbo configuration with a twin scroll unit sitting right underneath the front of the engine with very short header runners leading to the turbine housing. This is a huge contrast to the port fuel injected, single scroll turbo located above and behind the engine with past EJ series engines.

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Using E85 in a Subaru WRX/STI EJ25: A Guide

Subaru WRX / WRX STI

Using E85 in a Subaru WRX/STI EJ25: A Guide

By: Alan Jackson / November 8th, 2023

There is a lot of hype around using ethanol, or E85, in your Subaru WRX or STI. There are many benefits to it but it needs to be done correctly for a safe, effective increase in power and torque. Knowing how to make it work is the first step in setting up your WRX or STI for success.

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Does the Subaru WRX and STI Really Need a Catch Can?

Tech / Subaru WRX / WRX STI

Does the Subaru WRX and STI Really Need a Catch Can?

By: Alan Jackson / November 8th, 2023

A catch can is a device installed between the engine's crankcase and the intake system. It “catches” all the oil vapor that passes from the crankcase back into the intake system where the crankcase vents. This oil vapor has a low octane rating and also coats the walls of the entire intake tract and builds up over time. When the junk from the crankcase makes it's way into the cylinders, it can cause detonation and reduce the performance of the engine.

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Why the Cobb AP Should Be Your WRX’s First Modification

Subaru WRX / WRX STI / Parts

Why the Cobb AP Should Be Your WRX’s First Modification

By: Alan Jackson / October 30th, 2023

Modified Subarus have been around for quite some time now and fortunately for our generation, modifying them keeps getting easier and easier. The Subaru WRX and STI are great cars out of the box but if you're reading this, you are probably itching to modify yours. In the world of 2015 and newer Subaru WRX mods, there are plenty performance parts to choose from.

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New Product: Grimmspeed Catback Exhaust for Subaru WRX and STI

Subaru WRX / WRX STI

New Product: Grimmspeed Catback Exhaust for Subaru WRX and STI

By: JP Alonso / September 14th, 2017

You might be asking yourself why didn't Grimmspeed come out with an exhaust system sooner. The truth is that they don't just come out with products to come out with products. They want to be unique and functional. They don't want to be a "me too" brand, and that they aren't.

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Project Blue Boxer - Part 3: Nothing Too Flashy, Everything Functional

Subaru WRX / WRX STI

Project Blue Boxer - Part 3: Nothing Too Flashy, Everything Functional

By: JP Alonso / February 13th, 2017

Part 3 of Project Blue Boxer is comprised of a handful of very functional parts with a dash of style. A mixture of more power, better handling, and preventative modifications were all thrown at the car and we can honestly say the car is starting to set itself apart from the rest...finally.

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