3-4k$ will be tight but if this "Mazda guy" is hooking you up and doing all the work, I.E. wiring in the stand alone and tuning it. Then here is what you need.
Big turbo t3+, pt6262, borgwarner t04b or of the like
Waldoro fuel pump, 750cc injectors or greater
Tubular turbo manifold with 38/46mm wastegate and down pipe
3in exhaust
Haltech installed an tuned, with all needed sensors
Good 6 puck clutch, spec stage 4 or 5, comp or clutch master equivalent
Fic with piping all aluminum welded to fit your chassis 2.5in or better
Suspension to aid in traction, Megan tien or ksports
Tires to grip drag rads work best
Enjoy!