Subaru WRX / STI Mods

Looking to make your Subaru WRX or WRX STI faster and louder? Check out these exhaust modifications, intakes, and other upgrades. With so many different options from different brands, it can be hard to make a decision, but we're here to help. Here are the best WRX / STI mods that will make your car faster, better, and personalized.

Cobb Project Green Speed: What It Means For WRX Tuning

Does Cobb's Project Green Speed mean the end of WRX tuning? Fear not, it's still possible to make great power after this update. Here's what you need to know.

Subaru EJ25 Engine: Specs, Reliability, & Biggest Problems

Looking to buy an EJ25 powered Subaru, or just keep yours running in top shape? We've got everything you need to know.

Subaru FA20 Engine Specs, Information & Common Problems

Looking to learn more about Subaru's FA20 engine? We've got all of most important specs, information, and common problems you need to know about here.

Subaru WRX Brakes: Best 5 Kits For The 2015-2021 WRX

Looking for a brake upgrade for your Subaru WRX? We're here to help you sort through all the various options and decide what's right for you, and find something at a price that matches your budget.

11 Best Subaru WRX / STI Interior Mods & Accessories

If you want to customize your Subaru's interior, luckily there are a ton of aftermarket parts. Check out our list of the best 2015-2020 WRX interior mods and get started.

12 Best Subaru WRX / STI Shift Knobs

Upgrade your WRX or STI's stick shift knob with a new one from Billetworkz, Mishimoto, Perrin, and others. Add some extra weight and style.

Stage what? WRX Stages 1, 2, and 3 explained.

Confused by the different "stages" people talk about when they modify their Subaru WRX? Read on to learn more about what's required for each of the wrx stages.

9 Best WRX Tires? Summer, all-season or winter.

Looking for new tires for your Subaru WRX? Whether you need all-season, summer, or winter tires, we'll help you find the right ones in the right size.

10 Best Axleback Exhausts For 2015-2020 WRX / STI

If you want some more roar from your car, these Subaru WRX axlebacks will give you what you're craving, whether you want muffler deletes or something quieter.

Best Catback Exhausts for Your 2015+ WRX or STI

An aftermarket catback for the Subaru WRX really makes it sound aggressive and sportier. We've rounded up the best, whether you want something quiet or loud.

Best 2015-2020 WRX Top Mount Intercoolers

Looking to make big power? Upgrading to an aftermarket top mount intercooler is one of the important parts to get you there. We've compiled a list of the best.

Best Downpipes For Your 2015+ Subaru WRX

For the 2015+ WRX, a downpipe, otherwise known as a j-pipe is one of the best upgrades for power. We've rounded up the best catless and catted downpipes.

Best WRX Lowering Springs? Close up that wheel gap.

Want to lower your WRX? Lowering springs are the most affordable way you can do that with great results. We've reviewed the best ones.

Best Intakes for 2015-2020 Subaru WRX

Ready to hear all the crazy turbo sounds you're dreaming of? Hear the turbo spool up, and listen to those blow off sounds with these 2015-2020 WRX intakes.

Best WRX / STI Coilovers? Upgrade your suspension.

Looking to improve the handling and lower the ride height on your Subaru WRX or WRX STI? These are the best coilovers for any budget.

Best 2015+ WRX Exterior Mods? Make it your own.

Looking to add some of your own personality and style to your 2015+ WRX / STI? We've compiled a list of our favorite exterior mods.

Best Subaru WRX Mud Flaps? Rally Armor vs RokBlokz.

It seems almost every Subaru WRX you'll see has mud flaps installed. With popular choices like RokBlokz and Rally Armor, which one is best?

Best Front Lips for 2015-2020 WRX / STI

The 2015-2020 Subaru WRX's front end looks great, but a bit naked without a lip. You can dress up your car for some more aggressive looks with these front lips.

Best 2015+ Subaru WRX Catch Cans / AOS

Keep your Subaru WRX's engine clean with an air oil separator or catch can. Prevent carbon buildup on your intake valves.

Easy Oil Changes for the WRX? Fumoto Valve Review.

Is the Fumoto valve worth using on the 2015+ Subaru WRX? Does it make your oil changes easier, and is it safe? We've tested and reviewed it and found out.

8 Best Motor Oils for Subaru WRX / STI

If you want to keep your Subie running great for a long time, it's important you use the right motor oil. We've rounded up the best motor oil choices and compared them below.

Shift Your WRX Smoother? Perrin Shift Stop Review.

The Perrin Shift Stop is a great, easy way to make your WRX smoother and easier to shift. Is the shifter stop worth it? Read on to see our thoughts.

Best 2015+ Subaru WRX Stage 2 Kits?

Ready for more power with your Subaru WRX and want to go stage 2? Luckily there are complete kits from many different brands. Let's find out which one is best.

Flex Fuel for the WRX? Ethanol for big power gains.

If you're looking to add a lot of power to your Subaru WRX without going to extreme lengths, adding a Flex Fuel kit is one of the best modifications you can do.

The Subaru Impreza WRX first appeared in North America in 2002. The car was based on the Subaru Impreza that was built to compete in the 1992 World Rally Championship. Subaru claims WRX means "World Rally eXperimental," referring to the car's rally heritage.

This first generation made 227hp and 217ft-lbs of torque. In 2004, the Subaru Impreza WRX STI made its way to North America, making 300hp and 300 ft-lbs of torque, a significant increase over the standard Impreza WRX.

In 2009, the Subaru WRX got its biggest increase in power ever, up to 265 hp. The torque was increased to 244ft-lbs. This generation, the WRX STI got a smaller power increase, up to 305hp.

In 2015, the Subaru WRX underwent a major refresh. The EJ series engine was replaced with a new FA20DIT engine. This brought a minor power increase up to 268hp, and torque up to 258ft-lbs. The STI remained the same this generation, with the EJ engine, making the same horsepower. In 2018, a minor refresh of STI's engine tuning and internals brought it to 310 hp.

We've compiled these guides and comparisons so you can make the best choice when it comes to modifying your WRX or STI for more performance. While the power from the factory hasn't increased a whole lot over the years, there's a ton of extra power to be gained by modding your WRX!

ThinkTuning is a blog dedicated to car enthusiasts who love modifying, tuning, racing, and just driving their cars. We have guides and reviews for the top modifications you can purchase to make your car better and faster. We feature guides on car modification and buying the right mods, and car culture.

We have car mod guides for the Subaru WRX and WRX STI, Subaru BRZ / Toyota 86 / Scion FR-S, Nissan 370Z, and Nissan 350Z with more to come. We’ve noticed that it’s challenging to find all the information you need when modifying your car, so we’ve decided to try and collect, and combined with experience, make it easy car enthusiasts to modify and tune their own cars.