Volume Boost for Creative Zen MP3 Players

Having had repeated problems with my iPod Nano , I have recently bought a Creative Zen 30GB MP3 Player. On the iPod you could use a package called EUPod Pro to boost the volume beyond the cap placed on it by EU regulators. Does anyone know if there is a similar thing for the Creative Zen. The volume is fine when using my headphones but when using it in the car via a FM Transmitter I have to turn the volume right up (and then get deafened when I switch back to the radio).