Here are some costs:
JB4 tune $480 or Procede from Vishnu $700
Dual cone intake $95
FMIC (ER, Helix, Cp-e) $900
Charge pipe with meth bung $280
Meth kit $450
3" downpipes, AR Design $1,000
Single turbo $4,000 or RB twin turbos $3,200.
Sum total you are looking at min. $6,500 plus installation, but the car will have twice the power.
Audio: Jehnert Flatline speakers, Mobridge M1000 DA2 prepro, Helix P-DSP, Zapco Z-150.6 amp, CIC iDrive upgrade
Performance: MHD Pro Tune, AR Downpipes, ER FMIC/CP, DCI, RB turbos and inlets, KW V2 coilovers, Fuel-It Stage 2 pump w Ported fuel rail, Mfactory LSD