there are threads here which describes that.
i myself have used that and i am not satisfied... dami static... pricey pa... much better yung mga generic FM transmitters which you can buy at around 600 to 700 pesos dahil mas maganda ang transmission quality compared to the I-Trip. better yet, if your HU has a built-in AUX in, yun na lang gamitin mong connection between the HU and the IPOD. kung wala naman and may cassette player yung HU, cassette adapter na lang to connect with your IPOD.

if you will look into the tsikot classifieds, may mga nagbebenta ng FM transmitters dun na generic. try to contact them and request for a sound check and audition. you will be more satisfied using them instead of the ITrip.

imho.