im in a simliar situation
T04E on HKS manifold with ex gate. FMIC, bigger pump, gtr injectors
currently my management is a remapped ECU and HKS PFC F-Con. ive been considering my options with regard to management. basically YES GET IT TUNED! ive already blown the engine once hehe
anywa the options are remap or run a piggyback fuel controller like a SAFC or E-Manage
remap is good if you dont plan to mod further (is expensive to remap) piggy back is better if youre contiunally modding the car, however they have lmited control as they are only 'tricking' the computer.
it all depends on budget. my budget is relatively small ie 6-700
if youre able to spend in the 000's then go for a full replacement ECU, but expect to spend $3000 approx for fitted and tuned.