run in low 13
 

My car is 88 TII. Right now my it has HKS FCON and GCC, MSD 6A, HKS filter, and full RB Turbo exhaust and 3rd gen FD fuel pump(they are all used). I am wondering that what else do I need to make it run in low 13 or high 12 in 1/4 miles. I am not a rich guy so I prefer some cheap but practical parts such as rebuild turbo or intercooler from junk yard.