The best UIM you can purchase ready-made is also the least expensive. APN mail order - about $115 delivered to your door. It will come with a sleeved EGR passage, a new UIM gasket, a new throttle body gasket, a new UIM vacuum fitting for the brake booster and vacuum reservoir, a new PCV/MAP chamber cover, and two reduced diameter stovepipes.
Read about it in this Techinfo article: http://www.bonnevilleclub.com/forum/...e=article&k=38
where you will also find this link to the APN website:
http://www.automotivepartsnetwork.co...product=229679