Welcome to OA, i say grab a EDS IPF handheld tuning port which is a fantastic bit of kit and you can load your standard map back in for the services if your worried, and some type of induction kit, either a hi-flow filter in your standard air box, or the CDTi airbox setup if you have the cash.
http://www.regal-shop.co.uk/vauxhall...IPF.html#a6507