Are you doing the tuning? If not, dont buy a tuner for 3-400.
Contact Tom (1turbofocus), Tuner and tunes for $420 shipped. He will send you a base tune for your car, you datalog and he updates your tune.
Otherwise you pay, lets say $350 for tuner, then Tom charges you $150 for tune = $500.
Just get the tune and tuner from Tom.
2014 Focus SE Manual -
2006 Focus ZX4 SE Auto -commuter 110k /traded