the pulley upgrade should take you up to 9 or 10 lbs of boost. i've had mine on for about 10,000 miles and the 6 lb pulley for another 30,000.

if you get the entire kit (minus fuel pump since you already have) you'll be fine. in all honesty, the boost timing retarder is the most expensive part of the kit, and i really cant even tell if it makes a difference, i usually have it on stock setting.