Some ideas.
1. Chip to smooth out your shifting - about $200-250. No HP gain. Just makes your car more fun to drive.
2. Intake - about $35-300. Depending on if you buy just a cone filter or intake system.
Looking at about 2-3HP gain at the wheels.
3. 65mm TB - about $200-250. better throttle response, which make car more fun to drive. About 2-3HP gain at the wheels.
4. UDP - about $80-120. about a 2-3HP gain at the wheels.
5. Focus Fanatics sticker - free after 100 posts. About a 50HP gain at the wheels.
