Dude, are you sure your car's not running right?
Tampering with boost settings, if you're not sure what you're doing isn't recommended. Last thing you want is melt down. Boost will always be controlled by the ECU, to a certain extent. You push things too far, outside spec of electronic control, you'll have problems.
Either get a health check, at the likes of MRC, or other reputable tuner. Boost isn't everything, all cars are different, which is why I'm not a fan of generic chips. In some cars, 13psi can make less power than 10, if the other factors in the set-up don't like the extra 4psi...