Looking at fb marketplace and found a clean 15 Si with 76k miles runs on e85 pushing out 405hp and I’m here cause I know nothing about modifying I just like pimping out my rides lol but here’s the list and let me know if there good and dumb it down so I can understand please

Skunk 2 suspension.
Semi slick tires news.
Dw 400 pump module return kit.
Makspeed Journal Bearing turbo kit.
VMI 1000cc injectors.
RBC INTAKE manifold.
Insane shafts 500hp.
Hasport engine Mount set.
K-Tuned complete clutch master cylinder.
AEM boost gauge.
AEM oil pressure gauge.
AEM water temp, gauge.
PRL Motorsport RBC intake manifold adap.
Action clutch stage 3.
K-Tuned Fuel rail .
Omni 4 bar map sensor.
NGK laser iridium spark plugs.
Makspeed MS catch can battery holder.