water leaks are largely due to hardened or cracked rubber seals, maybe misalligned of rubber seals.
Have it replaced and it should be fine. For minor seal issues, a good DIY with some silicone paste could fix it in a jiffy...
Im looking to go single turbo with my 1jz...currently it is stock except for a few small mods...adjustable fpr, 3 inch exhaust, hks air filter, 2.5 inch piping for intercooler which is vr4...