i saw theres a FMIC in for sale and i was thinking of getting it but got told its better to upgrade my TMIC as the piping for the FMIC is long and increases lag. is this true?

i also thought of getting the vf37 twinscroll turbo and blitz boost controller and V3-4 STI Airflow Meter.

i have a 1999 classic wrx with 3' exhaust and high flow air intake and thats all i knew about but my friend said i have yellow fuel injectors which are sti ones and he thinks my turbo is different (it has no labeling on it that we could see) and thinks my AFM is changed aswell. oh and i was going to buy a sti ecu from him but turns out i have the exact same ecu already

thanks for any help