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If you've found yourself itching to modify your Ford Focus ST, there is tons of information out there on the subject and you may have learned plenty already. If you don't know already, the Focus ST responds very well to mods. But generally speaking, it only responds well to mods if you can tune for them. This is because the Focus ST’s ECU can learn and adjust to compensate for increased air flow. So if you are about to step out on the road to modifying your Focus ST, here are a few suggestions to help you get the most out of it.

There are a lot of people that buy a performance car with the immediate intention of modifying it and having fun. However some people are more concerned with maintaining the complete factory warranty and are therefore more cautious when it comes to modifying their car. There is nothing wrong with either approach and it really just comes down to personal preference. But for those of you who want to modify your car without running into any warranty issues, you should keep reading.

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.

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.

That is a mouthful, so from now on, I’m going to refer to this as EBCS. But what is a 3 Port EBCS? How is it different than stock? Why is it a good upgrade? Do you really need it? Let’s knock those questions out one by one…