Hi Chris,
You need a reputable tuner to remap your car, otherwise ............... god knows what
Most like the big names, APR, Superchips etc. I didnt, and had a custom Stage 1 map on my ED30 by someone I know does a good job (see the 'Ultimate Dyno thread')! And that the tuner is insured for any problems.
There are some excellent tuners out there, and some you would regret visiting.
Mark.