I just bought my first subaru, It is a 1988 Subaru GL-10 Turbo 1.8L 2wd Sedan, I would like to start doing some small modifications to the car, and slowly build the car up. I have enough stock parts to build this car over a total of 4 times (minus complete motors, transmissions, and shells, I have extra body panels and a ton of etc parts) 
  
Basically i was wondering for first of on this list of mods: 
  
5 Lug conversion 
  
Lowered suspention 
  
Blow off valve 
  
Front mount intercooler 
  
adjustable boost controller w/ boost gauge 
  
catback exhaust 
  
anything to add some small horsepower without breaking the bank too badly, or to make the car more reliable. 
  
please if somebody could start me off in the right direction that would be great, i just finished all of the body work to the car, now i am eager to start modding!