Originally Posted by NaztyG

im gonna help you out here and beat everyone who will tell you to "search" and get upset at you lol. cause i too was very interested in N/A mods when i first got my G. I cant tell you install prices as i do all my own work and hp gains i can only guess at and im sure someone will quote me and make fun of me.. so here

intake prob 5hp
underdrive pullies maybe 5hp
plenum and spacer i assume around 10hp
high flow cat or test pipe 5-10hp
cat back exhaust average around 10hp
through research i have found that headers dont really help much or w/e i dont know.
trying to get 50 extra N/A hp is asking for much but u can get close..
if u want acceleration performance and plan on dragging the car, i highly recommend the 3.9 final drive gears..almost half a second in the 1/4 difference. throw some drag radials on the car and ure looking at a mid 13 sec car(assuming u can drive).. hope that helped!! all this should be half the price of F/I.. id hope lol