mate the best advice i can give you is to take your car to an import specialist workshop...i advice you strongly against using the services of ultra tune there are a few reputable workshops that you can take your car to and have the piece of mind that it will be well looked after....boost worx, willall racing, morpowa, southern hitech, graham west workshops there are the ones off the top of my head at
you will find that there is a whole lot of stuff cheaper on these forums, online retailers like nengun, and also using the traders on the main section