Thinking about tinkering with your Subaru's exhaust? The up pipe might be a good place to start! It's a small part with a big impact, especially for WRX models. 

Let's break down what it does and how to pick the right one for you.

What is an up pipe?

Imagine a metal pipe connecting your engine's exhaust to the turbocharger. That's the up pipe! In most WRX models, it has a catalytic converter (cat) inside that can restrict performance.

Why replace it?

Most stock up pipes come with a catalytic converter (cat) inside. This cat can restrict exhaust flow, which means a little less power and slower turbo spool-up (when the turbo kicks in). Aftermarket up pipes often ditch the cat, potentially giving you a few extra horsepower and a quicker turbo response.

This can lead to:

More horsepower (around 10hp) - Not a huge jump, but every little bit counts!

Faster turbo spool time - Your turbo kicks in quicker, giving you a faster acceleration feel.

Up pipe Upgrades: Your Options Explained

Material: No clear winner here! Stainless steel is popular for its balance of price and durability. None are clearly the best. The main thing is to consider corrosion resistance and how well they hold heat.

Solid vs. flex pipe: Both work well. Solid might be slightly sturdier, but flex might be easier to install.

Cost: You can save money by gutting your stock up pipe (removing the cat yourself), but aftermarket up pipes offer better performance and are easier to install.

Things to Consider Before You Buy

Installation: It can be a DIY project, but takes a few hours. Up for the challenge?

The Final Gear:

Up pipes are a great way to get more out of your WRX's turbo. They're relatively affordable and offer noticeable performance gains. With a little research, you can find the perfect up pipe to unleash your Subaru's hidden potential!