this 4g63t is from evo3 current mods is only ARC big intercooler, mines ecu, knn 6inch air filter. fujitsubo catback only. stock boost. this is my bro car and so asking sifus here :p search previous threads bout 4g63 but all monster mods, not so applicable to me he planning rebuilt and to put in : 1)1.8mm cometic head gasket 2)iridium spark plug 3)aftermarket plug cable(if necessary?) 4) walbro 255lph intank fuel pump 5) boost meter 6)boost controller turbo seems got problem, wanna sent to rebuilt. to rebuilt back the same spec or upgrade to 20g is better? this car only wanna daily drive and sometimes boost here boost there only...not for race if the current mines ecu is good enuf, guess he wont install piggyback system at the moment.