you would at least need to upgrade your injectors, to be able to harness the full potential of the turbos you're going to upgrade to. if you want to run enough boost to spool up the turbos then you'll need enough fuel delivery to keep your air/fuel ratio safe. we can get you nismo 555 injectors for an RB26DETT for $1110 delivered. a sard fuel pressure regulator wouldnt hurt either, more fuel pressure = better injector spray pattern = more efficient combustion = more power. $195 for the reg.