Wheres a good place to start?
You will need to buy a tuning device. So far as i know, SCT is the only one that is compatible with your year focus.
There are a few options:
1. Find a local tuner and have them make a custom tume on the dyno for you.
+ Usually gets the most out of a car when done in-person on a dyno.
+ Done in a day
- your tuner may or may not be a focus-tuning expert.
2. Purchase a OTS tune from FSWERKS.com.
+ Easy to install, done in minutes
- boxed tunes dont always get the best out of your car.
3. PM 1turbofocus about his tuning services.
+ he has been doing focus tuning since the dawn of man
+ free updates to your tune as you add more parts
- done via datalogging and driving, not quite as good as via dyno
- can take a long time to get tune right.
The choice is yours