Quoting trexn8:
I have at least 15k in mine already and that is mostly maintenance and restoring.
Good lord that is alot.
$2500 - 4/1000 Galant VR4 with tons of goodies - 3in exhaust, 880cc injectors, Walbro 255LH, Aeromotive FPR, AEM Fuel rail, S16G, Spearco Intercooler, ACT 2600 and rebuilt transmission by Turbotrix
$600 - AEM EMS with all sensors
$75 - AEM Serial Gauge
$50 - Complete A/C System
$30 - 4 lug hubs with ABS sensors
$10 - Greddy Knock-off BOV retofitted with a real Greddy diaphragm
$80 - ADR 18in Sudoku Wheels with tires
Free - AEM Wideband, 18in ADR 5 spoke w/ 8 Blizzak Tires (from Dad's totalled RX-8), Goodwrench stainless steel brake/clutch line
$3345 @ 330awhp
I rebuilt the whole engine by selling off the DSMLink that came with the car which included a new machined block, 2G/1G combo, MLS headgasket, ARP headstuds, ACL race bearings, NPR piston rings and new gaskets all around. I reused the head and sold the 272 Webb Camshafts that came with the car as well.
I currently have a fully custom/built transmission coming in (free), Holset VGT turbo, custom exhaust and intake manifold (welding myself) which would push me into the 500-600hp range. I may build the spare block in the garage but that really depends. Cost to make that jump might only materials for welding since the VGT Holset costs about the same as the S16G. I have I also have 1600cc injectors but didn't factor it in considering I could easily sell my 880cc for the price I paid for them.
I hope that this VGT actually will live up to its hype.