So you buy a turbo kit: includes turbo, intercooler, BOV, piping, gaskets, bla bla.
So you would need to make an oil return line, custom down pipe. What else needs to be done?
Changing the stock internals would be good but for the sake of the question, we can run this turbo kit at a safe 6 psi on stock internals.
You need to tap your oil pan for the oil return line and you need to tap your block for the oil feed line. You also need to get the downpipe custom fit to your exhaust.
Depending on the motor and turbo size, you might have to cut a small section of the blocks webbing out. But past that, there isn't really anything that needs to be custom done.
ECLIPSE TALON GALANT TD05 TD05H 16G 4G63 4G63T 2.0L Turbo Charger Kit + J PIPE, 91 92 93 94-99 3000GT/3000 GT GTO/DODGE STEALTH VR4 3.0L TURBO AIR INTAKE Y PIPE, 2.5" UNIVERSAL FRONT MOUNT TURBO INTERCOOLER ALUMINUM PIPING KIT CHORME , CIVIC INTEGRA DEL SOL BOLT-ON TURBO INTERCOOLER PIPING KIT + SSQV BLOW OFF VALVE, Universal 3.0'' Stainless Steel V-band Clamp Turbo Charger Exhaust Down Pipe Kit, TURBO INTERCOOLER + PIPING KIT LANCER EVO 4 5 6 4G63 @@, Nissan Silvia S13 S14 S15 SR20DET 200SX 240SX Turbo Outlet Down Dump Pipe Kit, 30.5x12x3 FMIC 3.0" TURBO INTERCOOLER +Aluminum PIPING KIT +Blue SILICONE HOSES, UNIVERSAL 2.5" PIPING KIT RED+ALUMINUM 25X11.25X3 TURBO FRONT MOUNT INTERCOOLER, UNIVERSAL 2.5" PIPING KIT SLVR+ALUMINUM 25X11.25X3 TURBO FRONT MOUNT INTERCOOLER, UNIVERSAL FRONT MOUNT TURBO INTERCOOLER+BLUE PIPE PIPING KIT FMIC 27"X5.5"X2.5", 3" UNIVERSAL POWER COATED ALL BLACK FRONT MOUNT INTERCOOLER TURBO PIPING KIT , UNIVERSAL BLUE 2.5" PIPING KIT+ALUMINUM 25X11.25X3 TURBO FRONT MOUNT INTERCOOLER, 1995-1999 MITSUBISHI ECLIPSE DSM 2G 4G63 TD05 TURBO INTERCOOLER PIPING KIT, 2.5" DIY CHROME TURBO PIPING KIT BLACK W/ 28" INTERCOOLER SUPRA MR2 COROLLA AE86, UNIVERSAL FRONT MOUNT TURBO INTERCOOLER+RED PIPE PIPING KIT FMIC 27"X5.5"X2.5", 2.5" DIY BLACK TURBO PIPING KIT W/ 28" INTERCOOLER AUDI MK4 VW GOLF JETTA, 2.5" TURBO BLACK PIPING BLUE COUPLERS KIT w/ 31" INTERCOOLER CIVIC DEL SOL D16, Universal 2.5'' Aluminum FMIC Intercooler Piping Kit+Red Type-RS Turbo Bov Pipe, 00-05 3G ECLIPSE 4G64 T3 TURBO CHARGER KIT W/ PIPING, 1989-1994 NISSAN 240SX S13 SR20DET SR20 TURBO INTERCOOLER + PIPING KIT W/ FLANGE, 2.5" CUSTOM TURBO INTERCOOLER PIPING PIPE KIT+COUPLERS, 2.5" DIY CHROME BLUE TURBO PIPING KIT W/ 28" FMIC INTERCOOLER WRX EJ20 IMPREZA, 1995-1998 NISSAN 240SX SR20DET S14/S15 TURBO FMIC INTERCOOLER PIPING KIT, 2001-2005 LEXUS IS300 2JZGE TURBO FMIC INTERCOOLER + BOLT ON PIPING KIT, 2.5" DIY CHROME RED TURBO PIPING KIT + 28" FMIC INTERCOOLER GOLF JETTA GTI GLI, 1999-2004 VW JETTA PASSAT GOLF GTI 1.8T FRONT MOUNT TURBO INTERCOOLER PIPING KIT, 2002-2006 MITSUBISHI LANCER EVO 8 9 VIII IX TURBO INTERCOOLER + TURBO PIPING KIT, 2006-2008 HONDA CIVIC R18A1 R18 FMIC TURBO INTERCOOLER + BOLT ON PIPING KIT, 2.5" DIY BLACK RED TURBO PIPING KIT W/ 28" INTERCOOLER 92-00 CIVIC SI HB EK/EG,